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Interest in the joint venture Equity Method Investment, Ownership Percentage Other fees Institutional investment advisory and services fees receivable Accrued Fees and Other Revenue Receivable Exchange-traded futures Foreign Exchange Future [Member] Less: net gains recognized during the period on equity securities sold during the period Equity Securities, FV-NI, Realized Gain (Loss) Disposal group, including discontinued operation, net assets (liabilities) Net carrying amount of assets and liabilities divested Disposal Group, Including Discontinued Operation, Net Assets (Liabilities) Disposal Group, Including Discontinued Operation, Net Assets (Liabilities) Gross Amounts of Recognized Assets Derivative Asset, Subject to Master Netting Arrangement, before Offset Non-NEOs Non-NEOs [Member] CarVal CarVal Investors, L.P. [Member] CarVal Investors, L.P. 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Fair Value Fair Value Disclosures [Text Block] Additional investments by AB Holding with proceeds from exercise of compensatory options to buy AB Holding Units Proceeds from Stock Options Exercised Award Timing Disclosures [Line Items] Unaffiliated holders Unaffiliated Holders [Member] Represents holders of ownership interest in Company that are otherwise unaffiliated with Company. 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Brokers and Dealers [Abstract] Broker-Dealer [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Foreign Currency Translation and Transactions Foreign Currency Transactions and Translations Policy [Policy Text Block] Revolving Credit Facility Revolving Credit Facility [Member] Expiration Date Trading Arrangement Expiration Date Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Other revenues Noninterest Income, Other Operating Income Other Financial Instruments, Owned, Other, at Fair Value Financial Instruments Collateral Security Loaned, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset Fair value of equity interest in the JVs Equity Method Investments, Fair Value Disclosure Total Shareholder Return Amount Total Shareholder Return Amount Effective Income Tax Rate Reconciliation, Amount [Abstract] Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Offsetting Liabilities [Line Items] Offsetting Liabilities [Line Items] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Number of financial institutions with stated limits Number of financial institutions with stated limits The number of financial institutions with stated limits. Benefits from net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Interest in the joint venture, with an option Option To Acquire Controlling Interest In Joint Venture, Percentage Ownership Option To Acquire Controlling Interest In Joint Venture, Percentage Ownership Accumulated other comprehensive loss Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Equipment Equipment [Member] 2026 Lessor, Operating Lease, Payment to be Received (Refunded), Year Two Lessor, Operating Lease, Payment to be Received (Refunded), Year Two Prepaid expenses Prepaid Insurance Retirement Plan Name [Axis] Retirement Plan Name [Axis] Average daily borrowings Line of Credit Facility, Average Outstanding Amount Plan settlements Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement All-in-management fees All-In-Management Fees [Member] All-In-Management Fees [Member] JV related revenues JV Related Revenues [Member] JV Related Revenues Amortization of prior service cost Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Other assets Other due (to) from EQH and its subsidiaries Other Assets Less: Accumulated depreciation and amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization New York City City of New York [Member] City of New York [Member] Cash Cash [Member] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] (Redemptions) subscriptions of non-controlling interests of consolidated company-sponsored investment funds, net Proceeds from (Payments to) Noncontrolling Interests Pension cost amortization Other Comprehensive (Income) Loss, Defined Benefit Plan, Pension Cost Amortization, Reclassification Adjustment from AOCI, before Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Pension Cost Amortization, Reclassification Adjustment from AOCI, before Tax MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Deferred tax assets, gross Deferred Tax Assets, Gross Capital: Banking Regulation, Total Capital [Abstract] Distributions to non-controlling interests, net Temporary Equity, Increase (Decrease) from Distributions to Noncontrolling Interest Holders Temporary Equity, Increase (Decrease) from Distributions to Noncontrolling Interest Holders Concentration Risk Type [Domain] Concentration Risk Type [Domain] Summary of Investments Investment Holdings, Schedule of Investments [Table Text Block] Ownership Interest, Including Limited Partners Schedule of Other Ownership Interests [Table Text Block] Institutions Institutions [Member] Investment management, research and related services - Institutions Defined contribution expense for foreign entities Defined Contribution Plan, Cost Gross Amounts of Recognized Assets Security Borrowed, Subject to Master Netting Arrangement, before Offset Pro forma Pro Forma [Member] Schedule of Changes in Units Outstanding Schedule of Capital Units [Table Text Block] Issuance of AB units (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Document Fiscal Period Focus Document Fiscal Period Focus All Executive Categories All Executive Categories [Member] Fair value of assets acquired (excluding cash acquired of zero , zero and $40.8 million, for 2024, 2023 and 2022, respectively) Fair Value of Assets Acquired Equity securities: Equity securities Equity Securities [Member] Other distribution fees Other Distribution Revenues [Member] Other Distribution Revenues [Member] 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Two Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] ASSETS Assets [Abstract] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Other comprehensive (loss) gain Other Comprehensive Income (Loss), Net of Tax Document Type Document Type Master Exchange Agreement Master Exchange Agreement [Member] Master Exchange Agreement Interest rate on commercial paper outstanding Debt Instrument, Interest Rate, Effective Percentage Derivative Contract [Domain] Derivative Contract [Domain] Actuarial loss (gain) Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) FIN 48 reserve (release), percent Effective Income Tax Rate Reconciliation, FIN 48 Release, Percent Effective Income Tax Rate Reconciliation, FIN 48 Release, Percent Investments Disposal Group, Including Discontinued Operation, Investments Disposal Group, Including Discontinued Operation, Investments Joint Venture, International Joint Venture, International [Member] Joint Venture, International Business combination, contingent consideration arrangements, change in amount of contingent consideration, liability impairments Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Impairments Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Impairments Defined Benefit Plan [Table] Defined Benefit Plan [Table] Joint Venture Joint Venture [Member] Joint Venture Cash and Securities Segregated Under Federal Regulations and Other Requirements Restricted Assets Disclosure [Text Block] Depreciation and other amortization Depreciation, Amortization and Accretion, Net Maximum Maximum [Member] Investment owned at fair value, deconsolidated amount Investment Owned At Fair Value, Deconsolidated Amount Investment Owned At Fair Value, Deconsolidated Amount Amount of settlement Business Acquisition, Preacquisition Contingency, Amount of Settlement Contingent payment arrangements Business Combination, Contingent Consideration Arrangements, Amount Business Combination, Contingent Consideration Arrangements, Amount Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Offsetting Assets and Liabilities Offsetting Assets and Liabilities [Text Block] The entire disclosure for the offsetting assets and liabilities. Effect of ASC 740 adjustments, miscellaneous taxes, and other Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Finite-lived intangible assets subject to amortization, net Finite-Lived Intangible Assets, Net Furniture Furniture and equipment Furniture and Fixtures [Member] Investment Type [Axis] Investment Type [Axis] Deferred sales commission amortization period US fund (in years) Deferred Sales Commission Amortization Period Us Fund Remaining amortization period for any deferred sales commission related to US Funds. Schedule of Offsetting of Financial Liabilities Offsetting of Derivative Liabilities Offsetting Liabilities [Table Text Block] Other Other Services [Member] Investment management, research and related services - other Lease, cost Net lease cost Lease, Cost Statistical Measurement [Axis] Statistical Measurement [Axis] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] 2030 and thereafter Lessee, Operating Lease, Liability, Payments, Net Of Sublease Income, Due After Year Five Lessee, Operating Lease, Liability, Payments, Net Of Sublease Income, Due After Year Five Pre-tax Income Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Grantee Status [Domain] Grantee Status [Domain] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Investments in limited partnership hedge funds: Investments In Limited Partnership Hedge Funds [Member] The underlying investments of the limited partnership hedge funds invested in include long and short positions in equity securities, fixed income securities (including various agency and non-agency asset-based securities), currencies, commodities and derivatives (including various swaps and forward contracts). These investments are valued at quoted market prices or, where quoted market prices are not available, are fair valued based on the pricing policies and procedures of the underlying funds. Name Outstanding Recovery, Individual Name Societe Generale Canada Societe Generale Canada [Member] Societe Generale Canada Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Disposal Groups, Including Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Outside of North America Outside of North America [Member] Outside of North America Variable lease cost Variable Lease, Cost Bernstein research services Research Services [Member] Investment management, research and related services - Bernstein research services Interest in the joint venture hold Discontinued Operation, Equity Method Investment Retained after Disposal, Ownership Interest after Disposal Money markets Money Market Funds, at Carrying Value Title and Position [Axis] Title and Position [Axis] Held for sale asset disposal group Goodwill Disposal Group, Including Discontinued Operation, Goodwill Tax Credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount Award Timing Predetermined Award Timing Predetermined [Flag] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Distributions to General Partner and Unitholders Payments of Ordinary Dividends, Common Stock Foreign currency translation adjustments, before reclassification and tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax Investment, Name [Axis] Investment, Name [Axis] EQH EQH [Member] EQH Amortization of prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Expected future benefit payments [Abstract] Defined Benefit Plan, Expected Future Benefit Payment [Abstract] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] United States Income (Loss) from Continuing Operations before Income Taxes, Domestic Settlement related gains, transfers from AOCI to earnings, after tax Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Settlement Related Gains, Transfers from AOCI to Earnings, after Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Settlement Related Gains, Transfers from AOCI to Earnings, after Tax Current tax expense Current Income Tax Expense (Benefit) Total finance lease cost Finance Lease, Cost Finance Lease, Cost Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Hedge Funds Hedge Funds [Member] Ownership [Axis] Ownership [Axis] Annual vesting percentage for the term of award Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Retirement Benefits [Abstract] Retirement Benefits [Abstract] Investment in foreign subsidiaries Deferred Tax Assets, Investment in Subsidiaries Total capital Total capital Partners' capital attributable to AB Unitholders Partners' Capital, Including Portion Attributable to Noncontrolling Interest Trade execution, marketing, T&E and other Other Floor Brokerage, Exchange and Clearance Fees 2027 Lessor, Operating Lease, Payment to be Received, Year Three Statement of Financial Position [Abstract] Statement of Financial Condition: Statement of Financial Position [Abstract] Geographic Information [Abstract] Segments, Geographical Areas [Abstract] AP and Accrued Expenses Disposal Group, Including Discontinued Operation, Accounts Payable And Accrued Expenses Disposal Group, Including Discontinued Operation, Accounts Payable And Accrued Expenses Foreign outside basis difference Effective Income Tax Rate Reconciliation, Foreign Outside Basis Difference, Amount Effective Income Tax Rate Reconciliation, Foreign Outside Basis Difference, Amount Equity mutual funds Equity Mutual Funds [Member] Equity mutual funds. (Increase) decrease in receivables Increase (Decrease) in Receivables Lease liabilities Lease, Liability Lease, Liability Equity Income Mutual Fund Equity Income Mutual Fund [Member] Equity Income Mutual Fund Financial Instruments Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Other Deferred Tax Liabilities, Other Repledged securities Collateral Securities Repledged, Delivered, or Used Grant date fair value of vested shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Net income Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Investments owned Investment Owned, Fair Value Gains (Losses) Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Non-Contractual Revenues, Dividends Revenue Recognition, Dividends [Policy Text Block] Income tax Income tax expense Income Tax Expense (Benefit) Interest cost Interest cost on projected benefit obligations Defined Benefit Plan, Interest Cost Securities segregated (U.S. Treasury Bills) Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value Notional Value Derivative, Notional Amount Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Derivatives Net Amounts of Assets Presented in the Statement of Financial Condition Derivative Asset Shareholder servicing fees Shareholder servicing fees Shareholder Servicing Fees [Member] Shareholder Servicing Fees [Member] Period of recognition (in years) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Total lease payments Lease, Liability, Payments, Due Lease, Liability, Payments, Due Dilutive effect of compensatory options to buy AB Holding Units (in shares) Weighted Average Number Diluted Limited Partnership Units Outstanding Adjustment Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract] Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract] Changes in census data Defined Benefit Plan, Amounts Recognized In Other Comprehensive Income (Loss), Net Actuarial Gain (Loss) Changes In Census Data, Before Tax Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss) Changes In Census Data, Before Tax 2027 Deferred Sales Commission Future Amortization Expense Year Three The amount of amortization expense expected to be recognized during year three of the six succeeding fiscal years. Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Less: Broker-dealer related interest expense Less: Broker-dealer related Interest expense Interest Expense, Operating and Nonoperating Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] Regulatory Agencies [Axis] Regulatory Agencies [Axis] Regulatory bodies that establish capital requirements for member brokers and dealers. Business Acquisition [Line Items] Business Acquisition [Line Items] All Adjustments to Compensation All Adjustments to Compensation [Member] Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Reorganization costs Restructuring Charges Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Legal Entity [Axis] Legal Entity [Axis] Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Brokers and Dealers Brokers and Dealers [Member] Brokers and Dealers Long Term Incentive Plan Long Term Incentive Plan 1997 [Member] New long Term Incentive Plan adopted in 1997. Net Amounts of Assets Presented in the Statement of Financial Condition Securities Borrowed Brokerage clients Broker-Dealer, Payable to Customer Scenario [Domain] Scenario [Domain] Capital contributions (to) from AB Holding Proceeds from (Payments For) Contributions from (Distributions To) Affiliates Proceeds from (Payments For) Contributions from (Distributions To) Affiliates Related Party Transaction [Axis] Related Party Transaction [Axis] 2025 Lease, Liability, Payments, Due Next Twelve Months Lease, Liability, Payments, Due Next Twelve Months Receivables from Affiliates Capital Contribution Receivable [Member] Capital Contribution Receivable [Member] Total future minimum payments Lessor, Operating Lease, Payment to be Received Investments Debt Securities, Trading, and Equity Securities, FV-NI Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity Schedule of Share-Based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Entity Address, State or Province Entity Address, State or Province Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] General Partner’s Capital General Partner [Member] Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Number of restricted AB Units with a service requirement (in shares) Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Nonvested With Service Requirement Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested With Service Requirement Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Amortization of prior service cost Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Financial Instruments [Domain] Financial Instruments [Domain] Deferred Sales Commissions, Net Deferred Charges, Policy [Policy Text Block] Vesting [Domain] Vesting [Domain] Unvested, Beginning Weighted Average Grant Date Fair Value per AB Holding Unit (in dollars per share) Unvested, Ending Weighted Average Grant Date Fair Value per AB Holding Unit (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Offsetting Assets [Line Items] Offsetting Assets [Line Items] Net (Benefit) Expense Under the Retirement Plan Schedule of Net Benefit Costs [Table Text Block] Valuation allowance reserve (release), percent Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Restatement Determination Date Restatement Determination Date Offsetting Liabilities [Table] Offsetting Liabilities [Table] Derivatives Derivative [Member] Futures, forwards and swaps held Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral Credited to Costs and Expenses SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] 2027 Lease, Liability, Payments, Due Year Three Lease, Liability, Payments, Due Year Three Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Fair value, assets, level 2 to level 3 transfers, amount Fair Value, Assets, Level 2 to Level 3 Transfers, Amount Fair Value, Assets, Level 2 to Level 3 Transfers, Amount Business combination, contingent consideration, performance term Business Combination, Contingent Consideration, Performance Term Business Combination, Contingent Consideration, Performance Term Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] 2028 Deferred Sales Commission Future Amortization Expense Year Four The amount of amortization expense expected to be recognized during year four of the six succeeding fiscal years. Net Income Per Unit Earnings Per Share [Text Block] Cumulative translation losses Foreign Currency Transaction Loss, before Tax Subsequent Event Subsequent Event [Member] Retirement of AB Units for EQH Exchange Agreement Stock Retired During Period, Transaction with Affiliate , Value Stock Retired During Period, Transaction with Affiliate , Value Weighted average grant date fair value (in dollars per share) Granted, Weighted Average Grant Date Fair Value per AB Holding Unit (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Segments [Domain] Segments [Domain] Fixed Income Mutual Funds Fixed income mutual funds Fixed Income Mutual Funds [Member] Fixed income mutual funds. Schedule of Maturities of Finance Lease Liabilities Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Minimum financial resources/net capital required Broker-Dealer, Minimum Net Capital Required, Aggregate Indebtedness Standard Unrecognized Tax Benefits [Roll Forward] Unrecognized Tax Benefits [Roll Forward] Proceeds from debt, net Proceeds from Lines of Credit PEO PEO [Member] Net income per AB Unit: Earnings Per Unit [Abstract] Other commitment, funded capital Other Commitment, Funded Capital Other Commitment, Funded Capital Name Trading Arrangement, Individual Name Defined benefit plan, Unfunded Funded status Defined Benefit Plan, Funded (Unfunded) Status of Plan Distribution Made to Limited Partner [Line Items] Distribution Made to Limited Partner [Line Items] Long-term incentive compensation charge Compensation Expense Deferred Compensation Arrangement with Individual, Compensation Expense Valuation adjustment, expense on disposal group Disposal Group, Including Discontinued Operation, Valuation Adjustment, Expense (Credit) Disposal Group, Including Discontinued Operation, Valuation Adjustment, Expense (Credit) Property, Plant and Equipment by Type [Axis] Long-Lived Tangible Asset [Axis] Pension and other postretirement benefit plans, accumulated other comprehensive loss, before tax Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Entity Public Float Entity Public Float Disposal Group Name [Axis] Disposal Group Name [Axis] Operating and finance lease, remaining contract term Lessee, Lease, Remaining Term Of Contract Lessee, Lease, Remaining Term Of Contract 2028 Lessor, Operating Lease, Payment to be Received, Year Four 2025 Deferred Sales Commission Future Amortization Expense Year One The amount of amortization expense expected to be recognized during year one of the six succeeding fiscal years. Equity in earnings of equity method investments Income (Loss) from Equity Method Investments Uncommitted Lines of Credit Uncommited Lines of Credit [Member] Total Cash Paid for Open Market Purchases of AB Holding Units Payments for Repurchase of Equity Defined benefit plan, benefit obligation Projected benefit obligation at beginning of year Projected benefit obligation at end of year Defined Benefit Plan, Benefit Obligation VOEs Voting Interest Entities [Member] Voting Interest Entities [Member] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] 33.3% of Options and 25% of Restricted AB Holding Units, Third Anniversary Vesting Period Share-Based Payment Arrangement, Tranche Three [Member] AB Holding units available for future grant (in shares) Common Stock, Capital Shares Reserved for Future Issuance SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Local Phone Number Local Phone Number Valuation allowance Less: valuation allowance Deferred Tax Assets, Valuation Allowance Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Investment basis differences Deferred Tax Assets, Other Comprehensive Loss Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] PEO Total Compensation Amount PEO Total Compensation Amount Consideration for future put option to be exercised Consideration for future put option to be exercised by AB Consideration for Future Put Option to be Exercised Consideration for Future Put Option to be Exercised Brokers and dealers Receivable from Broker-Dealer and Clearing Organization Gross Amounts of Recognized Liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Cash distributions per unit paid to the general partner and unitholders (in dollars per unit) Distribution Made to Limited Partner, Distributions Paid, Per Unit Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan by Plan Asset Categories [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Assets of consolidated company-sponsored investment funds: Assets Of Consolidated Company-Sponsored Investment Funds [Abstract] Assets Of Consolidated Company-Sponsored Investment Funds AB Holding Units AB Holding Units [Member] AB Holding Units Return of cash collateral into brokerage accounts Cash Collateral Pledged Cash Collateral Pledged Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Contingent Payment Arrangements Level 3 Financial Instruments Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Credit Facility Line of Credit [Member] Contingent Payment Arrangement Expense Contingent Payment Arrangement Expense [Member] Contingent Payment Arrangement Expense Segment Reporting [Abstract] Segment Reporting [Abstract] Reclassification of AB CarVal contingent liability Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Reclassifications Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Reclassifications Intangible Assets, Net Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Entity Central Index Key Entity Central Index Key Distributions Made to Limited Partner [Table] Distributions Made to Limited Partner [Table] Scenario [Axis] Scenario [Axis] Cash on deposit with clearing organization Margin Deposit Assets Ramius Alternative Solutions LLC Ramius Alternative Solutions LLC [Member] Ramius Alternative Solutions LLC Cash paid: Cash Paid [Abstract] Discontinued Operations and Disposal Groups [Abstract] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Increase (decrease) in accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Partner Type of Partners' Capital Account, Name [Domain] Partner Type of Partners' Capital Account, Name [Domain] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Financial Instrument [Axis] Financial Instrument [Axis] Business Segment Information Segment Reporting Disclosure [Text Block] Fair Value, Inputs, Level 1, 2 and 3 Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Maximum percentage of award an employee can elect to allocate to deferred cash Maximum percentage of award an employee can elect to allocate to deferred cash Maximum percentage of award that an employee can elect to allocate to deferred cash. Title Trading Arrangement, Individual Title AB Units AB Units [Member] AB Units AB Holding Units held for Long-term Incentive Compensation Plans Deferred Compensation, Share-Based Payments [Member] Decrease (Increase) in other assets of consolidated company-sponsored investment funds Increase (Decrease) in Other Assets of Investment Funds, Net Increase (Decrease) in Other Assets of Investment Funds, Net Consolidated Entities [Axis] Consolidated Entities [Axis] Milestone equity method investment percentage related to guaranteed debt obligation Debt Instrument, Covenant, Milestone Equity Method Investment Percentage for Guarantee Debt Instrument, Covenant, Milestone Equity Method Investment Percentage for Guarantee Balance as of beginning of period Balance as of end of period Unrecognized Tax Benefits Less: Comprehensive income (loss) in consolidated entities attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Investment (losses) gains Principal Investment Gain (Loss) Consolidation of Company-Sponsored Investment Funds Consolidation, Variable Interest Entity, Policy [Policy Text Block] City Area Code City Area Code Auditor Location Auditor Location Other, primarily accrued expenses deductible when paid Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Contingent consideration liability Contingent payment arrangements Business Combination, Contingent Consideration, Liability Disposal Group Classification [Domain] Disposal Group Classification [Domain] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Reconciliation of Amounts Recognized in Other Comprehensive Income for the Retirement Plan Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Financial Instruments Collateral Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset Fees Receivable, Net Receivable [Policy Text Block] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Weighted Average Grant Date Fair Value per AB Holding Unit Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Cumulative CDSC received Cumulative Contingent Deferred Sales Commission Received Cumulative contingent deferred sales commission received as of the balance sheet date. Subsequent Event Type [Axis] Subsequent Event Type [Axis] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Equity [Abstract] Equity [Abstract] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Units retired (in shares) Stock Repurchased and Retired During Period, Shares Related Party Transaction [Line Items] Related Party Transaction [Line Items] General and administrative General and Administrative Expense Unrealized gains recognized during the period on equity securities held Equity Securities, FV-NI, Unrealized Gain (Loss) Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Operating lease liabilities Present value of lease liabilities Operating Lease, Liability Underlying Securities Award Underlying Securities Amount Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Line of credit facility interest rate Line of Credit Facility, Interest Rate During Period Assumptions used to determine net periodic benefit costs [Abstract] Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] 2029 Finance Lease, Liability, to be Paid, Year Five Decrease (Increase) in investments Increase (Decrease) in Financial Instruments Used in Operating Activities Revenue growth rate Measurement Input, Long-Term Revenue Growth Rate [Member] Amendment Flag Amendment Flag Unrealized (gains) losses on investments Marketable Security, Unrealized Gain (Loss) Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] U.S. Treasury bills pledged as collateral Securities Loaned, Fair Value of Collateral Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Defined Benefit Plan, Assets [Abstract] Defined Benefit Plan, Plan Assets, Allocations [Abstract] Schedule of Business Divestiture under Cash Flows Investing Activities Schedule of Business Divestiture under Cash Flows Investing Activities [Table Text Block] Schedule of Business Divestiture under Cash Flows Investing Activities Total Lease Liabilities, Payments Due [Abstract] Lease Liabilities, Payments Due [Abstract] Non-redeemable non-controlling interests in consolidated entities Partners' Capital Attributable to Noncontrolling Interest Debt securities Defined Benefit Plan, Debt Security [Member] Amortization of right-of-use assets Finance Lease, Right-of-Use Asset, Amortization Actual return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Debt Debt Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Current Expected Credit Losses- Receivables from Brokerage clients and Receivables from Revenue Contracts with Customers Financing Receivable [Policy Text Block] Payments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Entity Address, Postal Zip Code Entity Address, Postal Zip Code Interest rate swaps Interest Rate Swap [Member] Long-term Purchase Commitment [Table] Long-Term Purchase Commitment [Table] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Corporate subsidiaries' federal, state, and local Effective Income Tax Rate Reconciliation, Federal, State And Local Income Taxes, Amount Effective Income Tax Rate Reconciliation, Federal, State And Local Income Taxes, Amount Grantee Status [Axis] Grantee Status [Axis] (Decrease) increase in payables Increase (Decrease) in Other Accounts Payable Other revenues Noninterest Income, Other Operating Income, Excluding Revenue From Contract With Customer Noninterest Income, Other Operating Income, Excluding Revenue From Contract With Customer Amounts Included in Accumulated Other Comprehensive Income (Loss) for the Retirement Plan Defined Benefit Plan Amounts Recognized In Accumulated Other Comprehensive Income [Table Text Block] Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in accumulated other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, including unamortized amounts of the net transition asset or obligation. Long-term incentive compensation Partners' Capital Account, Deferred Compensation Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Auditor Name Auditor Name Director Share-Based Payment Arrangement, Nonemployee [Member] Forfeited, Weighted Average Grant Date Fair Value per AB Holding Unit (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value (Decrease) in other liabilities of consolidated company-sponsored investment funds, net Increase (Decrease) in Other Liabilities of Investment Funds Increase (Decrease) in Other Liabilities of Investment Funds Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Useful life (in years) Property, Plant and Equipment, Useful Life Schedule of Short-term Debt [Table] Short-Term Debt [Table] UBT business allocation percentage rate change, percent Effective Income Tax Rate Reconciliation, Unincorporated Business Tax BAP Rate Change, Percent Effective Income Tax Rate Reconciliation, Unincorporated Business Tax BAP Rate Change, Percent Cash acquired from acquisition Cash Acquired from Acquisition Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Furniture, equipment and leasehold improvements, net Furniture, equipment and leasehold improvements, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Net foreign currency transaction gains (losses) Realized Gain (Loss), Foreign Currency Transaction, before Tax Derivative Asset [Abstract] Derivative Asset [Abstract] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Securities Borrowed [Abstract] Securities Borrowed [Abstract] Long-term incentive compensation-related Long-term Incentive Compensation-Related [Member] Investments are typically made in services that are notionally elected by long-term incentive compensation plan participants and maintained in a consolidated rabbi trust or separate custodial account. The rabbi trust and custodial account enable the company to hold such investments separate from our other assets for the purpose of settling our obligations to participants. Total assets Assets Depreciation and amortization Deferred Tax Assets, Depreciation And Amortization Deferred Tax Assets, Depreciation And Amortization Distribution-related payments Commissions and distribution payments to financial intermediaries Cost of Goods and Services Sold Purchases of furniture, equipment and leasehold improvements Payments to Acquire Property, Plant, and Equipment Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount FIN 48 reserve (release) Effective Income Tax Rate Reconciliation, FIN 48 Release, Amount Effective Income Tax Rate Reconciliation, FIN 48 Release, Amount Commitments and contingencies (See Note 14) Commitments and Contingencies Schedule of Difference Between the Effective Tax Rates and UBT Statutory Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Termination Date Trading Arrangement Termination Date Alternative net capital requirement Broker-Dealer, Minimum Net Capital Required, Alternative Standard US SEC US Securities And Exchange Commission [Member] Regulatory body which holds primary responsibility for enforcing the federal securities laws and regulating the securities industry, the nation's stock and options exchanges, and other electronic securities markets in the United States. Title of 12(g) Security Title of 12(g) Security Related Party Transaction [Table] Related Party Transaction [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] 2026 Lessee, Operating Lease, Liability, to be Paid, Year Two Gross to net deferred sales commissions [Abstract] Gross to net deferred sales commissions [Abstract] Additional AB restricted units granted (in shares) Additional Restricted Units Granted The number of additional grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Sublease Receipts Operating Leases, Future Minimum Payments Receivable [Abstract] Period over which receivables from brokers and dealers for sale of shares of company-sponsored mutual funds generally are realized Period Over Which Receivables from Brokers and Dealers for Sale of Shares of Company-sponsored Mutual Funds Generally are Realized Represents the period over which receivables from brokers and dealers for sale of shares of company-sponsored mutual funds generally are realized. Other due (to) from EQH and its subsidiaries Other Liabilities Net Amount Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Effect of ASC 740 adjustments, miscellaneous taxes, and other, percent Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Cash collateral received Cash Collateral Received Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Net income attributable to AB Unitholders Net income attributable to AB Unitholders Net Income (Loss) Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Revenues Investment advisory and services fees Revenue from Contract with Customer, Including Assessed Tax Schedule of Other Significant Segment Items Segment, Reconciliation of Other Items from Segments to Consolidated [Table Text Block] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Schedule of Offsetting of Financial Assets Offsetting of Derivative Assets Offsetting Assets [Table Text Block] Retirement Plan Asset Allocation Schedule of Allocation of Plan Assets [Table Text Block] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Open-market purchases of AB Holding Units Purchased (in units) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Purchased for Award Entity File Number Entity File Number Payments Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Actuarial Computations Used to Determine Net Periodic Benefit Costs Defined Benefit Plan, Assumptions [Table Text Block] Consolidated Entities [Domain] Consolidated Entities [Domain] Sanford C Bernstein Inc Acquisition Sanford C Bernstein Inc Acquisition [Member] Acquisition of investment research and management company. Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Option to acquire controlling interest in joint venture, term Option To Acquire Controlling Interest In Joint Venture, Term Until Option Commences Option To Acquire Controlling Interest In Joint Venture, Term Until Option Commences Capital Loss Carryforward Capital Loss Carryforward [Member] Adjustment Temporary Equity, Other Changes Contributions to qualified profit sharing plan Deferred Compensation Arrangement with Individual, Contributions by Employer Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Name Forgone Recovery, Individual Name Payables recorded under contingent payment arrangements Noncash or Part Noncash Acquisition, Payables Assumed Award Date [Domain] Award Date [Domain] Operating leases Operating Lease, Weighted Average Remaining Lease Term Other, net Other Noncash Income (Expense) Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Deferred tax liability: Components of Deferred Tax Liabilities [Abstract] Expected Future Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Reductions for prior year tax positions Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Maximum amount of deferred cash Maximum amount of deferred cash Maximum amount of deferred cash an employee can elect to allocate under the plan. Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Accrued compensation and benefits Disposal Group, Including Discontinued Operation, Accrued Compensation And Benefits Disposal Group, Including Discontinued Operation, Accrued Compensation And Benefits PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Proceeds from legal settlements Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement Other assets Other Assets Of Investment Funds Other Assets Of Investment Funds Adjustment to Compensation: Adjustment to Compensation [Axis] Deferred sales commissions [Abstract] Deferred sales commisions [Abstract] Net income (loss) of consolidated entities attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Other Defined Benefit Plan, Other [Member] Defined Benefit Plan, Other [Member] Derivative Liability [Abstract] Derivative Liability [Abstract] Maximum risk of loss in investment in VIEs Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Expected Amortization of Deferred Sales Commissions Schedule Of Amortization Of Deferred Sales Commissions Future Amortization Expense [Table Text Block] Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for amortization of deferred sales commissions. Accumulated other comprehensive (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Related Party [Axis] Related and Nonrelated Parties [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] AB AllianceBernstein Corporation [Member] AllianceBernstein Corporation [Member] Changes in estimates Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability, Increase (Decrease) In Estimates Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Increase (Decrease) in Estimates North America North America [Member] Target plan asset allocation weighting, percent Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Cash Distributions Stockholders' Equity, Policy [Policy Text Block] Re-valuation of AB Holding Units held in rabbi trust Re-Valuation Of Holding Units Held In Trust Re-Valuation Of Holding Units Held In Trust Name Awards Close in Time to MNPI Disclosures, Individual Name Revenue Benchmark Revenue Benchmark [Member] Entity Filer Category Entity Filer Category Direct costs to sell Payments for Disposition Related Costs Payments for Disposition Related Costs AB units purchased and retired in private transactions (in shares) Stock Repurchased and Retired in Private Transactions, Shares Stock Repurchased and Retired in Private Transactions, Shares Total future minimum payments Operating Leases, Net Future Minimum Payments Due The total of net future contractually required payments on leases defined as operating. Financial Instruments Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset Statistical Measurement [Domain] Statistical Measurement [Domain] Components of Lease Expense and Supplemental Cash Flow Information Lease, Cost [Table Text Block] Components of Deferred Sales Commissions Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] Mutual Fund Underwriting Activities Commissions, Policy [Policy Text Block] Director Director [Member] Mutual Funds Mutual Fund [Member] Purchases of AB Holding Units to fund long-term compensation plans, net Partners' Capital Account, Treasury Units, Purchased Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Other Fees Other Fees [Member] Other Fees All Trading Arrangements All Trading Arrangements [Member] Partnership UBT Federal Tax On Partnership Gross Business Income The effective tax based on the (gross) business income. Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Other liabilities Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities Earnings Per Unit, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] VIEs Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Long-term incentive awards vesting periods Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Capital loss carryforward Tax Credit Carryforward, Amount Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Derivative [Line Items] Derivative [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] Loss on plan assets Defined Benefit Plan, Plan Assets, Period Increase (Decrease) Joint ventures Equity Method Investments Pay vs Performance Disclosure [Line Items] Redeemable non-controlling interest of consolidated entities Redeemable non-controlling interest Redeemable non-controlling interest as of December 31, 2023 Redeemable non-controlling interest as of December 31, 2024 Redeemable Noncontrolling Interest, Equity, Carrying Amount Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Derivative [Table] Derivative [Table] Employee Share-Based Payment Arrangement, Employee [Member] Retired Individual Plan Supplemental Employee Retirement Plan [Member] Cash distributions to Unitholders Partners' Capital Account, Distributions Other Performance Measure, Amount Other Performance Measure, Amount 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Three Schedule of Activity of Unvested Restricted Holding Units Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Leases Lessee, Operating Leases [Text Block] Foreign Foreign Income Tax Expense (Benefit), Continuing Operations Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Reductions for current year tax positions Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions Operating lease cost Operating Lease, Cost Debt Short-Term Bank Loans and Notes Payable Gross Amounts Offset in the Statement of Financial Condition Security Borrowed, Subject to Master Netting Arrangement, Liability Offset Defined Benefit Plan Disclosure [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Furniture and equipment, net Disposal Group, Including Discontinued Operation, Property, Plant and Equipment Industry Sector [Domain] Industry Sector [Domain] Weighted average units outstanding—basic (in shares) Weighted Average Limited Partnership Units Outstanding, Basic Interest on lease liabilities Finance Lease, Interest Expense Corporate subsidiaries' federal, state, and local, percent Effective Income Tax Rate Reconciliation, Federal, State And Local Income Taxes, Percent Effective Income Tax Rate Reconciliation, Federal, State And Local Income Taxes, Percent Federal Federal Income Tax Expense (Benefit), Continuing Operations Less: Accumulated amortization Accumulated Amortization of Other Deferred Costs Minimum years that remain open and may be subject to examination vary under local law Minimum years that remain open and may be subject to examination vary under local law Element represents the minimum number of years that will remain open may be subject to examination vary under local law. CarVal CarVal [Member] CarVal Non-cash financing activities: Non-cash Financing activities: [Abstract] Entity Tax Identification Number Entity Tax Identification Number Equity Equity securities Defined Benefit Plan, Equity Securities [Member] Additions for prior year tax positions Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Retirement Plan Type [Axis] Retirement Plan Type [Axis] EQH Purchase Agreement EQH Purchase Agreement [Member] EQH Purchase Agreement Summary of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] U.S. Treasury Strips US Treasury Securities [Member] Cash and securities segregated, at fair value (cost $495,391 and $859,448) Cash and Securities Segregated under Federal and Other Regulations Maximum years that remain open and may be subject to examination vary under local law Maximum years that remain open and may be subject to examination vary under local law Element represents the maximum number of years that will remain open may be subject to examination vary under local law. Plan Name [Axis] Plan Name [Axis] Thereafter Finance Lease, Liability, to be Paid, after Year Five Statement, Equity Components [Axis] Equity Components [Axis] Total lease payments Finance Lease, Liability, to be Paid United States Treasury Bills in special reserve bank custody account for exclusive benefit of brokerage customers Cash and Securities Segregated under Securities Exchange Commission Regulation Balance as of beginning of period Balance as of end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Total expenses Costs and Expenses Unrecognized net loss from experience different from that assumed and effects of changes and assumptions Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Deferred tax and payable write-offs, percent Effective Income Tax Rate Reconciliation, Deferred Tax And Payable Write-Offs, Percent Effective Income Tax Rate Reconciliation, Deferred Tax And Payable Write-Offs, Percent Receivable [Domain] Receivable [Domain] Fair value of non-redeemable non-controlling interest recorded Fair Value Of Non-Redeemable Non-Controlling Interest Recorded Fair Value Of Non-Redeemable Non-Controlling Interest Recorded Investments [Domain] Investments [Domain] Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Repatriation of foreign earnings Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount Geographical [Axis] Geographical [Axis] Net deferred tax asset Deferred Tax Assets, Net 2029 Lessee, Operating Lease, Liability, to be Paid, Year Five (Gain) on divestiture Pre-tax gain on divestiture Gain (Loss) on Disposition of Business Award Date [Axis] Award Date [Axis] Net receivable balance Receivables, Net, Current Weighted Average Weighted Average [Member] Total Cash Paid for AB Holding Units Purchased Stock Repurchased During Period, Value Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] CPH Capital CPH Capital [Member] CPH Capital Proceeds from issuance of private units to EQH Proceeds from Issuance of Common Limited Partners Units Non-cash lease expense Operating Lease, Expense Issuance of AB Units for EQH Exchange Agreement Stock Issuance During Period, Transaction with Affiliate , Value Stock Issuance During Period, Transaction with Affiliate , Value Prior service cost Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax Weighted average discount rate: Leases, Weighted Average Discount Rate [Abstract] Leases, Weighted Average Discount Rate 2028 Lease, Liability, Payments, Due Year Four Lease, Liability, Payments, Due Year Four Cash and cash equivalents as of beginning of the period Cash and cash equivalents as of end of the period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Net Amount Securities Borrowed, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election Acquisition of businesses, net of cash acquired Cash Acquired from Acquisition, Net Cash Acquired from Acquisition, Net Recognized actuarial gain Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax Settlement related gains, after tax Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Settlement Related Gains, after Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Settlement Related Gains, after Tax Accrued interest payable recorded on the consolidated 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Valuation Adjustment, Allowance Disposal Group, Including Discontinued Operation, Valuation Adjustment, Allowance Related Party Transaction [Domain] Related Party Transaction [Domain] Seed capital Seed Capital [Member] Seed money which is provided to investment teams to develop new products and services. Capital contributions to equity method investments Payment of Capital Contribution to Joint Venture Payment of Capital Contribution to Joint Venture AB Holding Units Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Income not taxable resulting from use of UBT business apportionment factors and effect of compensation charge Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Employee compensation and benefits Labor and Related Expense Short-term debt Short-Term Debt (Decrease) increase in overdrafts payable Proceeds from (Repayments of) Bank Overdrafts Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Other commitment Other Commitment Long-term Incentive Compensation Plans Compensation Related Costs, General [Text Block] Summary of the Cost and Fair Value of Available-For-Sale and Trading Investments Unrealized Gain (Loss) on Investments [Table Text Block] Finance leases Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Right-of-use assets Disposal Group, Including Discontinued Operation, Right-Of-Use Assets Disposal Group, Including Discontinued Operation, Right-Of-Use Assets Subsequent Events Subsequent Events, Policy [Policy Text Block] Gross Amounts Offset in the Statement of Financial Condition Security Loaned, Subject to Master Netting Arrangement, Asset Offset Retirement Plan Name [Domain] Retirement Plan Name [Domain] Number of uncommitted lines of credit, matured Number of Uncommitted Lines of Credit, Matured Number of Uncommitted Lines of Credit, Matured Recognized actuarial gain Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Entity [Domain] Entity [Domain] Concentration risk Concentration Risk, Percentage Credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Assets held for sale Assets held for sale Disposal Group, Including Discontinued Operation, Assets Income not taxable resulting from use of UBT business apportionment factors and effect of compensation charge, percent Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent Total Institutional investment advisory and services fees receivable Net Total carrying value as of the balance sheet date of Institutional investment advisory fees, services fees receivables, and other receivables (payables) to be collected from (obligations owed to) related parties, net as of the balance sheet date. Derivatives Net Amounts of Liabilities Presented in the Statement of Financial Condition Derivative Liability Interest on borrowings Interest Expense, Borrowings Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Equitable Holdings, Inc. And Subsidiaries Equitable Holdings, Inc. And Subsidiaries [Member] Equitable Holdings, Inc. And Subsidiaries Schedule of Long term Incentive Compensation Arrangement by Award Plan Name [Axis] Schedule of Long term Incentive Compensation Arrangement by Award Plan Name [Axis] Pertinent data describing and reflecting required disclosures pertaining to an incentive compensation arrangement, by plan. 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Brokers and dealers Disposal Group, Including Discontinued Operation, Accounts Payable, Brokers and Dealers Disposal Group, Including Discontinued Operation, Accounts Payable, Brokers and Dealers Amounts written-off as uncollectible Accounts Receivable, Allowance for Credit Loss, Writeoff Recurring Fair Value, Recurring [Member] Maximum number of awards authorized for issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Number of Shares Per Employee Return of cash collateral into brokerage accounts Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset1 Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset1 Long-term Incentive Compensation Plan, Deferral Limit Long-term Incentive Compensation Plan, Deferral Limit [Member] Long-term Incentive Compensation Plan, Deferral Limit Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Impairment charge Asset Impairment Charges Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Total assets measured at fair value Plan assets at fair value at beginning of year Plan assets at fair value at end of year Defined Benefit Plan, Plan Assets, Amount Operating Lease, Liability, Statement of Financial Position [Extensible List] Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Investment Holdings [Table] Investment Holdings [Table] Commercial Paper Commercial Paper [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Units issued (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Income tax (expense) Income tax (expense) Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Document Annual Report Document Annual Report 2027 Finance Lease, Liability, to be Paid, Year Three Base fees Base Fees [Member] Base Fees [Member] Gain on divestiture Equity Method Investment, Realized Gain (Loss) on Disposal Prior service cost Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax Bernstein Research Services Bernstein Research Services [Member] Investment management, research and related services - Bernstein research services Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Incentive Compensation Plan Alliance Bernstein Incentive Compensation Award Program [Member] Incentive compensation plan under which annual awards may be granted to eligible employees Operating and finance lease, term of termination option Lessee, Lease, Term Of Termination Option Lessee, Lease, Term Of Termination Option Balances of Consolidated VIEs and VOEs Included In Condensed Consolidated Statements of Financial Condition Condensed Balance Sheet [Table Text Block] Indefinite-lived intangible assets not subject to amortization Indefinite-Lived Intangible Assets (Excluding Goodwill) Issuance (retirement) of AB Units, net Stock Issued (Retired) During Period, Net, Value Stock Issued (Retired) During Period, Net, Value Amortization of intangible assets Amortization of Intangible Assets Divestiture of business (includes $304.0 million in cash proceeds) Cash outflow from divestiture Cash Divested in Divestiture of Businesses Cash Divested in Divestiture of Businesses Net Payments Operating Leases, Future Net Minimum Payments Due [Abstract] Movement in Valuation Allowances and Reserves SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Alternative method of calculating aggregate debit items arising from customer transactions permitted by rule, percent Net Capital Minimum Required Minimum Target Alternate Calculation The percentage under alternative method of calculating the aggregate debit items arising from customer transactions permitted by rule. Rule requires the larger of this percentage or the base minimum amount. Accounting Policies [Abstract] Accounting Policies [Abstract] Liabilities: Liabilities [Abstract] Revenues: Revenues [Abstract] Loss Contingencies Commitments and Contingencies, Policy [Policy Text Block] Leasehold improvements Leasehold Improvements [Member] Option swaps Swaption [Member] Current Fiscal Year End Date Current Fiscal Year End Date Balance at Beginning of Period Balance at End of Period SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Less interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Fair value of deferred tax asset recorded Fair value of Deferred Tax Asset Recorded Fair value of Deferred Tax Asset Recorded PEO Name PEO Name Amortization of right-of-use assets Finance Lease, Right-of-Use Asset, Accumulated Amortization Number of newly-issued units (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Receivables, net: Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net Vesting [Axis] Vesting [Axis] Award Type [Domain] Award Type [Domain] Compensation and Benefits Expense Compensation and Benefits Expense [Member] Compensation and Benefits Expense 2025 Lessor, Operating Lease, Payment to be Received, Year One Weighted average units outstanding - diluted (in shares) Weighted Average Limited Partnership Units Outstanding, Diluted Diluted (in dollars per share) Diluted net income per AB Unit (in dollars per unit) Net Income (Loss), Net of Tax, Per Outstanding Limited Partnership Unit, Diluted Discontinued Operations, Held-for-sale Discontinued Operations, Held-for-Sale [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Non-PEO NEO Non-PEO NEO [Member] Intangible assets acquired, estimated useful life Finite-Lived Intangible Asset, Useful Life Total investments Investments Investments, Fair Value Disclosure Net revenues Net revenues Revenues, Net of Interest Expense Other assets Disposal Group, Including Discontinued Operation, Other Assets Qualified Employee Benefit Plans Retirement Benefits [Text Block] Counterparty Risk Concentration Risk Disclosure [Text Block] Short-term Debt [Line Items] Short-Term Debt [Line Items] Recently Adopted Accounting Pronouncements/Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Title and Position [Domain] Title and Position [Domain] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Assets and Liabilities Held for Sale Disposal Group, Assets and Liabilities Held-for-Sale [Policy Text Block] Disposal Group, Assets and Liabilities Held-for-Sale 2028 Finance Lease, Liability, to be Paid, Year Four Accumulated amortization of intangible assets Finite-Lived Intangible Assets, Accumulated Amortization Valuation of Retirement Plan Assets by Pricing Observability Levels Schedule of Defined Benefit Plans Disclosures [Table Text Block] Receivables from affiliates Capital contributions receivable from affiliates Amounts due from affiliates of the reporting entity related to the capital contributions during the period. Name Measure Name Entity Interactive Data Current Entity Interactive Data Current Various smaller acquisitions Series of Individually Immaterial Business Acquisitions [Member] Limited partners or members ownership interest in company (percent) Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Number of operating segments Number of Operating Segments Deferred tax asset: Components of Deferred Tax Assets [Abstract] Income taxes paid Income Taxes Paid Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Employment and Separation Agreements Employee Severance [Member] Net capital Broker-Dealer, Net Capital Contingent consideration liability, measurement input Business Combination, Contingent Consideration, Liability, Measurement Input Non-cash long-term incentive compensation expense Share-Based Payment Arrangement, Noncash Expense Deferred tax asset Deferred Tax Assets, Net of Valuation Allowance NAV Expedient Fair Value Measured at Net Asset Value Per Share [Member] 33.3% of Options and 25% of Restricted AB Holding Units, Second Anniversary Vesting Period Share-Based Payment Arrangement, Tranche Two [Member] Regulatory Agencies [Domain] Regulatory Agencies [Domain] List of regulatory agencies. Revenue subject to contracts with customers Noninterest Income Reductions related to closed years/settlements with tax authorities Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Changes in third-party seed investments in consolidated funds Redeemable Noncontrolling Interest, Changes in Third-party Seed Investments Redeemable Noncontrolling Interest, Changes in Third-party Seed Investments State and local State and Local Income Tax Expense (Benefit), Continuing Operations Non-operating income Nonoperating Income (Expense) Long-term Incentive Compensation Plans [Abstract] Compensation Related Costs [Abstract] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Valuation and Qualifying Accounts - Allowance for Doubtful Accounts SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Auditor Firm ID Auditor Firm ID Effective tax rate, percent Effective Income Tax Rate Reconciliation, Percent Non-Contractual Revenues, Interest Revenue Recognition, Interest [Policy Text Block] Operating income Operating Income (Loss) Valuation allowance reserve (release) Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Total liabilities, non-controlling interest and capital Total liabilities, non-controlling interest and capital Liabilities and Equity Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Fair Value Hierarchy and NAV [Axis] Defined Benefit Plan, Fair Value of Plan Assets by Measurement [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Designation [Axis] Hedging Designation [Axis] Derivative Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] 2026 Finance Lease, Liability, to be Paid, Year Two Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Investment in foreign subsidiaries Deferred Tax Liabilities Investment In Subsidiaries Deferred Tax Liabilities Investment In Subsidiaries Operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Industry Sector [Axis] Industry Sector [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Measurement Input Type [Axis] Measurement Input Type [Axis] Individual: Individual [Axis] Gain (loss) on disposition of assets Property, Plant and Equipment, Disposals Accumulated Other Comprehensive (Loss) AOCI Attributable to Parent [Member] Liabilities held for sale Liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities Product and Service [Axis] Product and Service [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Statement [Line Items] Statement [Line Items] International: International [Member] Revenues from external customers attributed to all foreign countries in total from which the entity derives revenues Measurement Input Type [Domain] Measurement Input Type [Domain] Stanford C. Bernstein & Co.,LLC Stanford C. Bernstein & Co.,LLC [Member] Wholly-owned subsidiary of AllianceBernstein that provides Bernstein research services in the United States Private Wealth Management Private Wealth Management [Member] Investment management, research and related services private wealth management. Schedule of Consolidated Financial Statements for Transactions with Related Parties Schedule of Related Party Transactions [Table Text Block] Net Amount Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election AB mutual funds Accounts Payable, Other Alternative excess net capital Broker-Dealer, Excess Net Capital, Alternative Standard Expenses: Expenses: Operating Expenses [Abstract] Minimum net capital required per stock exchange and SEC rules Broker-Dealer, Minimum Net Capital Required, Broker-Dealer Subsidiary, Alternative Standard Benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid Autonomous LLC Autonomous LLC [Member] Autonomous LLC Furniture, Equipment and Leasehold Improvement, Net Property, Plant and Equipment [Table Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Sublease income Sublease Income Deferred Sales Commissions, Net Deferred Sales Commissions Net [Text Block] Disclosure related to our deferred sales commissions showing the components of deferred sales commissions, net as well as the current and future amortization expense. Balance as of beginning of period Balance as of end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Schedule of Change in Carrying Value Level 3 Financial Instruments Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Schedule Of Regulatory Capital Agencies And Requirements [Table] Schedule Of Regulatory Capital Agencies And Requirements [Table] Minimum Minimum Minimum [Member] Adoption Date Trading Arrangement Adoption Date Related Party Transactions [Abstract] Related Party Transactions [Abstract] AB funds fees Other Receivables Total assets measured at fair value and other measurements Assets, Fair Value Disclosure And Other Measurements Assets, Fair Value Disclosure And Other Measurements Cash and securities segregated, at cost Cash And Securities Segregated At Cost Amount of cash subject to withdrawal restrictions, restricted deposits held as compensating balances, and cash and securities segregated in compliance with regulations (such as cash deposited in a special reserve account for the exclusive benefit of customers pursuant). Deferred compensation arrangement with individual, fair value of shares issued Deferred Compensation Arrangement with Individual, Fair Value of Shares Issued Total investments measured at fair value and other measurements Investments, Fair Value Disclosure And Other Measurements Investments, Fair Value Disclosure and Other Measurements Income tax benefit (expense) Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Receivables, net: Receivables, Net, Current [Abstract] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Changes in employee benefit related items: Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent [Abstract] Segments [Axis] Segments [Axis] Granted to employees and eligible directors Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] General Partner General Partners' Capital Account Debt repayments from equity method investments Proceeds from Equity Method Investment, Distribution, Return of Capital Exercise Price Award Exercise Price Schedule of Tax Effect of Significant Items Comprising the Net Deferred Tax Asset (Liability) Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Increase (decrease) in accrued compensation and benefits Increase (Decrease) in Employee Related Liabilities Arrangement Duration Trading Arrangement Duration Other Other Revenues [Member] Other Revenues [Member] NOL carryforwards Operating Loss Carryforwards Leases Lessee, Finance Leases [Text Block] Changes in employee benefit related items Changes in employee benefit related items Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Variable Interest Entity [Table] Variable Interest Entity [Table] SCB LLC Subsidiaries [Member] Investments Investments Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Statement of Financial Position [Extensible Enumeration] Debt Disposal Group, Including Discontinued Operation, Debt Disposal Group, Including Discontinued Operation, Debt Earnings before income taxes: Oil and Gas, Result of Operation, before Income Tax Expense (Benefit) [Abstract] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Financial Instruments Collateral Derivative Asset, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset Finance lease liabilities Present value of lease liabilities Finance Lease, Liability 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Four All Individuals All Individuals [Member] Gross Amounts of Recognized Liabilities Security Loaned, Subject to Master Netting Arrangement, before Offset 2026 Deferred Sales Commission Future Amortization Expense Year Two The amount of amortization expense expected to be recognized during year two of the six succeeding fiscal years. Less: reclassification adjustment for (losses) included in net income upon retirement plan liquidation Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) from Plan Liquidation, Reclassification Adjustment from AOCI, before Tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) from Plan Liquidation, Reclassification Adjustment from AOCI, before Tax Other International Other International [Member] Other International Deferred tax and payable write-offs Effective Income Tax Rate Reconciliation, Deferred Tax And Payable Write-Offs, Amount Effective Income Tax Rate Reconciliation, Deferred Tax And Payable Write-Offs, Amount Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Schedule of Leases Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Distribution revenues Distribution and Shareholder Service [Member] Foreign Retirement Plans Other Postretirement Benefits Plan [Member] Societe Generale Societe Generale [Member] Societe Generale Weighted average interest rates on average daily borrowings Weighted Average Interest Rates On Average Daily Borrowings Weighted average interest rates on average daily borrowings Intangible assets, net Intangible assets, net of accumulated amortization Intangible Assets, Net (Excluding Goodwill) Schedule of Long term Incentive Compensation Arrangement by Award Plan Name [Domain] Schedule of Long term Incentive Compensation Arrangement by Award Plan Name [Domain] Schedule of Long term Incentive Compensation Arrangement by Award Plan Name [Domain] Non-redeemable Non-controlling Interests in Consolidated Entities Nonredeemable Noncontrolling Interest [Member] Nonredeemable Noncontrolling Interest Unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Undistributed earnings of non-U.S. corporate subsidiaries Undistributed Earnings of Foreign Subsidiaries Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Change in plan assets: Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract] Transaction costs Business Acquisition, Transaction Costs Assets, Fair Value Disclosure [Abstract] Assets, Fair Value Disclosure [Abstract] Equity consideration issued in connection with acquisition Stock Issued Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Related Party [Domain] Related and Nonrelated Parties [Domain] Cash Collateral Pledged Security Loaned, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Liabilities of consolidated company-sponsored investment funds Liabilities, Noncurrent Long-term Purchase Commitment [Line Items] Long-Term Purchase Commitment [Line Items] Weighted average remaining lease term (years): Weighted Average Remaining Lease Term [Abstract] Weighted Average Remaining Lease Term Joint ventures Financial Instruments, Owned, at Fair Value Net Amount Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Conversion of AB units (in shares) Conversion of Stock, Shares Converted Total amount of AB Holding Units Purchased (in units) Stock Repurchased During Period, Shares Foreign subsidiaries taxed at different rates, percent Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Decrease (increase) in other assets Increase (Decrease) in Other Operating Assets 2017 Grant 1 Twenty Seventeen Grant 1 [Member] Twenty Seventeen Grant 1 [Member] Statement of Partners' Capital [Abstract] Statement of Partners' Capital [Abstract] Employee benefit 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benefit obligation: Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Measure: Measure [Axis] Additions for current year tax positions Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Investments: Investments [Abstract] 2028 Lessee, Operating Lease, Liability, Payments, Net Of Sublease Income, Due Year Four Lessee, Operating Lease, Liability, Payments, Net Of Sublease Income, Due Year Four 2025 Defined Benefit Plan, Expected Future Benefit Payment, Year One Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Credit default swaps Credit Default Swap [Member] Entity Emerging Growth Company Entity Emerging Growth Company Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Income Tax, Examination [Table] Income Tax, Examination [Table] Total liabilities measured at fair value Total liabilities measured at fair value Liabilities, Fair Value Disclosure Cash distribution, distribution declared (in dollars per unit) Distribution Made to Limited Partner, Distributions Declared, Per Unit Other Other investments Other Investments [Member] Limited partners, units outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Limited Partners' Capital Account, Units Outstanding Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Investments, other measurements Investments, Measurements Other than Fair Value Investments, Measurements Other than Fair Value Limited partners: 292,107,907 and 286,609,212 units issued and outstanding Limited Partners' Capital Account AB Holding AB Holding [Member] AB Holding [Member] Property and equipment, net Finance Lease, Right-of-Use Asset, after Accumulated Amortization Partners' Capital, Limited Partner's Capital Account, Class [Table] Partners' Capital, Limited Partner's Capital Account, Class [Table] Accretion Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Accretion Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Accretion Equity Component [Domain] Equity Component [Domain] Purchases of AB Holding Units to fund long-term incentive compensation plan awards, net Payments for Repurchase of Other Equity Japan JAPAN Dividend and interest income Interest and Dividend Income, Operating Brokers and dealers Broker-Dealer, Payable to Other Broker-Dealer and Clearing Organization Adjustments to reconcile net income to net cash provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] General partnership interest in company (percent) Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Units Outstanding Units Outstanding [Text Block] The entire disclosure of an entity's capital units or capitals shares outstanding. Remeasurement of contingent payment arrangements Increase (decrease) in contingent consideration payable Contingent payment arrangements Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Entity Shell Company Entity Shell Company Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Comprehensive Income Comprehensive Income, Policy [Policy Text Block] Deferred sales commissions, net Deferred sales commissions, net Capitalized Contract Cost, Net Units Outstanding Increase (Decrease) in Partners' Capital [Roll Forward] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Thereafter Lease, Liability, Payments, Due After Year Five Lease, Liability, Payments, Due after Year Five Summary of Investment Holdings [Line Items] Summary of Investment Holdings [Line Items] Statement [Table] Statement [Table] Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities Measurement Frequency [Domain] Measurement Frequency [Domain] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Retirement plan loss Gain (Loss) on Pension Settlement Gain (Loss) on Pension Settlement Real Estate Real Estate [Member] General partnership number of general partnership units owned in holding company (in shares) General Partners' Capital Account, Units Outstanding Income tax benefit Accumulated Other Comprehensive Income Loss Tax Effect Tax effect on the accumulated change in equity from transactions and other events and circumstances from non-owner sources. Gain from changes in discount rate and lump sum interest rates Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Change in Discount Rate and Interest Rate Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Change in Discount Rate and Interest Rate Number of uncommitted lines of credit Number of uncommitted lines of credit The number of uncommitted lines of credit. Performance-based fees Performance-Based Fees [Member] Performance-based Fees [Member] Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities Furniture, equipment and leasehold improvements, gross Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Deferred sales commission amortization period non US funds (in years) Deferred Sales Commission Amortization Period Non Us Funds Remaining amortization period for any deferred sales commission related to non-US Funds. Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Level 1 Fair Value, Inputs, Level 1 [Member] Foreign currency translation adjustments, net of tax Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] 2026 Lease, Liability, Payments, Due Year Two Lease, Liability, Payments, Due Year Two Granted AB holding unit net of forfeitures (in shares) Share based Compensation Arrangement by Share based Payment Award, Units, Granted Net of forfeitures Number of holding units granted, net of forfeitures. Limited Partners' Capital Limited Partner [Member] Long-term incentive compensation plans Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation 2030 and thereafter Lessor, Operating Lease, Payment to be Received, after Year Five Income tax expense: Income Tax Expense (Benefit), Continuing Operations [Abstract] Percentage guarantee of unpaid debt obligation Guarantee of Unpaid Debt Obligation, Percentage Guarantee of Unpaid Debt Obligation, Percentage Commitments And Contingencies Disclosure [Table] Commitments And Contingencies Disclosure [Table] Commitments And Contingencies Disclosure Employer contribution Defined Benefit Plan, Plan Assets, Contributions by Employer Schedule of Revenues for Services Provided or Related to the Mutual Funds Revenues For Services Provided Or Related To The Mutual Funds [Table Text Block] A tabular disclosure for revenues for services provided or related to the mutual funds which includes investment management, distribution, shareholder and administrative, and brokerage services. Operating and finance lease, maximum term of extension option Lessee, Lease, Maximum Term Of Extension Option Lessee, Lease, Maximum Term Of Extension Option LIABILITIES, REDEEMABLE NON-CONTROLLING INTEREST AND CAPITAL LIABILITIES, REDEEMABLE NON-CONTROLLING INTEREST AND CAPITAL [Abstract] LIABILITIES, REDEEMABLE NON-CONTROLLING INTEREST AND CAPITAL Change in Projected Benefit Obligation, Fair Value of Plan Assets and Funded Status of Plan Schedule of Changes in Projected Benefit Obligations [Table Text Block] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Time deposits Bank Time Deposits [Member] Income Taxes Income Tax Disclosure [Text Block] 2028 Lessee, Operating Lease, Liability, to be Paid, Year Four Mortality assumption Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss) Changes in Mortality Assumption, before Tax Amount before tax, after reclassification adjustments, of actuarial gain (loss) due to changes in mortality assumption that has not been recognized in the income statement. Defined benefit plan, benefit obligation, payment for settlement Defined Benefit Plan, Benefit Obligation, Payment for Settlement AB Holding Units held for long-term incentive compensation plans Deferred Compensation Equity Limited partners units issued (in units) Limited Partners' Capital Account, Units Issued Initial cash contributed to joint ventures from transferring balance sheet Payments to Acquire Interest in Joint Venture Investment advisory and services fees Investment Advice [Member] Investment Advice [Member] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Retail Retail [Member] Operating leases Operating Lease, Weighted Average Discount Rate, Percent Unrealized gains (losses), net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Credit Facility [Axis] Credit Facility [Axis] Decrease (increase) in securities, segregated Increase (Decrease) in Restricted Investments for Operating Activities Entity Registrant Name Entity Registrant Name Audit Information [Abstract] Audit Information Investment in joint ventures Investment in Joint Ventures [Member] Investment in Joint Ventures Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Depreciation and amortization expense Depreciation, Depletion and Amortization Net Amount Securities Loaned, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election Fair Value as of Grant Date Award Grant Date Fair Value Foreign subsidiaries taxed at different rates Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] AllianceBernstein L.P. (AB) Affiliated Entity [Member] Other comprehensive income Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax Level 2 Fair Value, Inputs, Level 2 [Member] Number of distribution channels Number of Distribution Channels Number of Distribution Channels Offsetting Assets [Table] Offsetting Assets [Table] Geographical [Domain] Geographical [Domain] Schedule of Revenues Disaggregation of Revenue [Table Text Block] Intangible assets Disposal Group, Including Discontinued Operation, Intangible Assets Principles of Consolidation Consolidation, Policy [Policy Text Block] EQH Uncommitted Facility EQH Uncommitted Facility [Member] EQH Uncommitted Facility Restatement Determination Date: Restatement Determination Date [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Document Financial Statement Error Correction Document Financial Statement Error Correction [Flag] Number of financial institutions offering lines of credit Number of financial institutions offering lines of credit The number of financial institutions offering lines of credit. Issuance of AB Units for CarVal acquisition Stock Issued During Period, Value, Acquisitions Stock issued during period, acquisitions (in shares) Stock Issued During Period, Shares, Acquisitions UBT statutory rate UBT statutory rate,percent Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Distribution revenues Distribution Revenues [Member] Distribution Revenues [Member] Foreign outside basis difference, percent Effective Income Tax Rate Reconciliation, Foreign Outside Basis Difference, Percent Effective Income Tax Rate Reconciliation, Foreign Outside Basis Difference, Percent Derivative Liability, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag Derivative Liability, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag Derivative Liability, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] UBT statutory rate Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Average daily borrowings Short-Term Debt, Average Outstanding Amount Cash payments to relieve operating lease liabilities Operating Lease, Payments Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Ownership [Domain] Ownership [Domain] Right-of-use assets Lease, Right-Of-Use Assets Lease, Right-Of-Use Assets Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Defined benefit plan, actual plan asset allocations, percent Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage Lease liability Deferred Tax Asset, Lease Liability Deferred Tax Asset, Lease Liability Disposal Group, Held-for-Sale, Not Discontinued Operations Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] Furniture, Equipment and Leasehold Improvements, Net Property, Plant and Equipment, Policy [Policy Text Block] Intangible assets Deferred Tax Liabilities, Intangible Assets Number of deconsolidated funds Investment Deconsolidated Investment Deconsolidated EQH Facility Interest EQH Facility Interest EQH Facility Interest (Gain) loss on assets held for sale Adjustments to Assets Held-For-Sale Adjustments to Assets Held-For-Sale 2024 Finite-Lived Intangible Asset, Expected Amortization, Year One Amounts outstanding under credit facility EQH Facility Long-Term Line of Credit Partners’ capital attributable to AB Unitholders Partners' capital, beginning balance Partners' capital, ending balance Partners' Capital Granted (in shares) Restricted Units Awarded (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Credit facility, possible aggregate incremental limit increase Line Of Credit Facility, Maximum Possible Aggregate Incremental Increase Line of Credit Facility, Maximum Possible Aggregate Incremental Increase Gross Amounts Offset in the Statement of Financial Condition Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Business Combinations Business Combinations Policy [Policy Text Block] Luxembourg LUXEMBOURG Discount rate on benefit obligations Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Total revenues Total revenues Revenues Deconsolidated funds Noncontrolling Interest, Decrease from Deconsolidation Total Deferred Sales Commissions Future Amortization Expense The aggregate estimated amortization expense for succeeding fiscal years for deferred sales commissions subject to amortization. Dividend and interest income, net of interest expense Interest And Dividend Income, Net, Operating Interest And Dividend Income, Net, Operating Employees based outside of the United States Employees Based Outside of the United States [Member] The award for employees based outside of the U.S. Transaction cost Disposal Group, Including Discontinued Operation, Transaction Cost Disposal Group, Including Discontinued Operation, Transaction Cost Entity Address, City or Town Entity Address, City or Town 12b-1 fees 12b-1 Fees [Member] 12b-1 Fees [Member] Leases Lessee, Leases [Policy Text Block] Partner Type [Axis] Partner Type [Axis] Gross Amounts Offset in the Statement of Financial Condition Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Number of independent directors Number of Independent Directors Number of Independent Directors Divestitures Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Actual net capital in excess of the minimum net capital required Banking Regulation, Total Risk-Based Capital, Excess, Actual Carrying amount of deferred sales commissions Deferred Sales Commissions Gross Gross commissions paid to financial intermediaries in connection with the sale of shares of open-end company-sponsored mutual funds sold without a front-end sales charge. These commissions are capitalized as deferred sales commissions and amortized over periods not exceeding five and one-half years for U.S. fund shares and four years for non-U.S. fund shares, the periods of time during which deferred sales commissions are generally recovered. Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Cash Collateral Received Security Borrowed, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Business Acquisition [Axis] Business Acquisition [Axis] Square feet of office space sub-leased Area of Real Estate Property Company-sponsored investment funds Consolidated Investment Portfolios [Member] Consolidated Investment Portfolios [Member] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Redeemable Noncontrolling Interest [Roll Forward] Redeemable Noncontrolling Interest [Roll Forward] Redeemable Noncontrolling Interest Brokerage clients Disposal Group, Including Discontinued Operation, Accounts Payable, Brokerage Customers Disposal Group, Including Discontinued Operation, Accounts Payable, Brokerage Customers Foreign Tax Jurisdiction Foreign Tax Jurisdiction [Member] Right-of-use asset Deferred Tax Liabilities, Leasing Arrangements Financing Leases Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Capital contributions from (to) AB Holding Capital Contributions Received From (Paid To) Related Parties Capital Contributions Received From (Paid To) Related Parties Revenue Recognition Revenue from Contract with Customer [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Product Concentration Risk Product Concentration Risk [Member] AB Investments Alliance Bernstein Investments [Member] Wholly-owned subsidiary of AllianceBernstein that services retail clients and distributes company-sponsored mutual funds Total assets measured at fair value Total assets measured at fair value Assets, Fair Value Disclosure Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Five Document Period End Date Document Period End Date Held for sale reclassification Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Held For Sale Reclassification Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Held For Sale Reclassification Total lease payments Lessee, Operating Lease, Liability, to be Paid Revenue not subject to contract with customer Revenue Not Subject To Contract With Customer Revenue Not Subject To Contract With Customer Number of unvested restricted AB Holding Units (in shares) Unvested, beginning balance (in shares) Unvested, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Non-cash investing activities: Cash Flow, Noncash Investing Activities Disclosure [Abstract] Insider Trading Arrangements [Line Items] Securities Loaned [Abstract] Securities Loaned [Abstract] Net income per unit, basic and diluted [Abstract] Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax [Abstract] Financial Instruments Collateral Security Borrowed, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset 2027 Lessee, Operating Lease, Liability, to be Paid, Year Three Accumulated benefit obligation Defined Benefit Plan, Accumulated Benefit Obligation Excluding company-sponsored investment funds Excluding Company-Sponsored Investment Funds [Member] Excluding Company-Sponsored Investment Funds Reclassification Reclassification, Comparability Adjustment [Policy Text Block] Less: reclassification adjustment for (losses) included in net income upon liquidation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax Corporate subsidiaries: Corporate subsidiaries: [Abstract] Document Transition Report Document Transition Report Schedule of Revenue by Major Customers, by Reporting Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Retirement plan, number of investments Retirement plan, number of investments The number of investments under the retirement plan. Schedule of Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Tax credit, percent Effective Income Tax Rate Reconciliation, Tax Credit, Percent Redeemable Non-controlling Interest Redeemable Noncontrolling Interest [Table Text Block] Brokerage Clients Brokerage Clients [Member] Brokerage Clients Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Entity Current Reporting Status Entity Current Reporting Status Collateral advances, allowance Collateral Advances, Allowance Collateral Advances, Allowance Number of restricted AB Units without a service requirement (in shares) Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Nonvested Without Service Requirement Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested Without Service Requirement Unrecognized net gain from experience different from that assumed and effects of changes and assumptions Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax Other Other Equity Securities [Member] Other Equity Securities [Member] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] 2025 Lessee, Operating Lease, Liability, Payments, Net Of Sublease Income, Remainder Of Fiscal Year Lessee, Operating Lease, Liability, Payments, Net Of Sublease Income, Remainder Of Fiscal Year Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Foreign currency translation adjustments, before tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Executive Category: Executive Category [Axis] Schedule of Earnings Before Income Taxes and Income Tax Expense Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Payment of acquisition-related debt obligation Repayments of Other Long-Term Debt Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] Net assets Net Assets Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] Company Selected Measure Name Company Selected Measure Name