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[Member] CarVal Investors, L.P. 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VIEs Derivative Asset Total Cash Paid for AB Holding Units Purchased/Retained Stock Repurchased During Period, Value Limited Partners' Capital Account by Class [Axis] Limited Partners' Capital Account by Class [Axis] Offsetting [Abstract] Offsetting [Abstract] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Non-redeemable Non-controlling Interests in Consolidated Entities Nonredeemable Noncontrolling Interest [Member] Nonredeemable Noncontrolling Interest Underlying Securities Award Underlying Securities Amount Less: Comprehensive income (loss) in consolidated entities attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Revenue Recognition Revenue from Contract with Customer [Text Block] Operating and finance lease, remaining contract term Lessee, Lease, Remaining Term Of Contract Lessee, Lease, Remaining Term Of Contract Retirement plan funding Retirement Plan Funding Retirement Plan Funding AB Holding Units held for long-term incentive compensation plans Deferred Compensation Equity Uncommited Lines of Credit Uncommited Lines Of Credit [Member] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items] VOEs Voting Interest Entities [Member] Voting Interest Entities [Member] Cash Distributions Cash Distributions [Text Block] The entire disclosure for cash distributions. Operating leases Operating Lease, Weighted Average Discount Rate, Percent Segment Reporting [Table] Segment Reporting [Table] Amendment Agreement Amendment Agreement [Member] Amendment Agreement Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Continuing Operation [Abstract] Geographic Information [Abstract] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area [Abstract] Summary of Components of Lease Expense and Supplemental Cash Flow Information Lease, Cost [Table Text Block] Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Continuing Operation [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Balance as of beginning of period Balance as of end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating income Operating Income (Loss) Weighted average remaining lease term (years): Weighted Average Remaining Lease Term [Abstract] Weighted Average Remaining Lease Term [Abstract] Current Fiscal Year End Date Current Fiscal Year End Date Summary of Maturities of Finance Lease Liabilities Finance Lease, Liability, to be Paid, Maturity [Table Text Block] 2026 (excluding the six months ended June 30, 2026) Finance Lease, Liability, to be Paid, Remainder of Fiscal Year Limited partners, units issued (in shares) Limited Partners' Capital Account, Units Issued Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative [Line Items] Derivative [Line Items] Long-lived assets Long-Lived Asset, Excluding Financial Instrument, Customer Relationship, Mortgage Servicing Right, Deferred Policy Acquisition Cost, and Deferred Tax Asset, Amount Units granted to employees and eligible directors (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture Futures, forwards and swaps held Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral Total amount of AB Holding Units Purchased/Retained (in shares) Stock Repurchased During Period, Shares 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] Entity File Number Entity File Number Consideration for future put option to be exercised Consideration For Future Put Option To Be Exercised Consideration For Future Put Option To Be Exercised Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Total investments Investment owned Investment Owned, Fair Value Distribution revenues Distribution and Shareholder Service [Member] Equity securities Equity securities Equity Securities [Member] Distributions (to) non-controlling interests, net Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Open Market Purchases of AB Holding Units Purchased (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Purchased for Award Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Financial Instruments Collateral Security Loaned, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset Measure: Measure [Axis] Balance as of beginning of period Balance as of end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Decrease in securities, segregated Increase (Decrease) in Restricted Investments for Operating Activities Assets of consolidated company-sponsored investment funds: Assets Of Consolidated Company-Sponsored Investment Funds [Abstract] Assets Of Consolidated Company-Sponsored Investment Funds Units Outstanding Increase (Decrease) in Partners' Capital [Roll Forward] Gross Amounts of Recognized Assets Security Borrowed, Subject to Master Netting Arrangement, before Offset AB Holding Units AB Holding Units [Member] AB Holding Units Decrease (increase) in investments Increase (Decrease) in Financial Instruments Used in Operating Activities Equity Components [Axis] Equity Components [Axis] Product and Service [Domain] Product and Service [Domain] Deferred sales commissions, net Capitalized Contract Cost, Net Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Finance Leases Finance Lease Assets And Liabilities Lessee [Abstract] Finance Lease Assets And Liabilities Lessee [Abstract] Entity Interactive Data Current Entity Interactive Data Current Net income (loss) of consolidated entities attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Net (losses) on derivative instruments Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Limited Partners' Capital Limited Partner [Member] Entity Small Business Entity Small Business Comprehensive income attributable to AB Unitholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Termination Date Trading Arrangement Termination Date AB Holding AB Holding [Member] AB Holding [Member] Investment gains (losses) Investment gains (losses) Principal Investment Gain (Loss) Payments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Divestitures Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Accretion Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Accretion Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Accretion Employee benefit related items, net of tax Changes in employee benefit related items, net of tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Net Amount Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Cash Collateral Security Loaned, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Net Amounts of Assets Presented in the Statement of Financial Condition Derivative Asset, Subject to Master Netting Arrangement, after Offset 2029 Finance Lease, Liability, to be Paid, Year Three Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Continuing Operation [Abstract] Document Type Document Type 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] Income tax (expense) Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Fair Value as of Grant Date Award Grant Date Fair Value Units Outstanding Units Outstanding [Text Block] The entire disclosure of an entity's capital units or capitals shares outstanding. Significant Accounting Policies Significant Accounting Policies [Text Block] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Investment advisory and services fees Investment Advice [Member] Local Phone Number Local Phone Number Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Retirement plan loss Gain (Loss) On Pension Settlement Gain (Loss) On Pension Settlement Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies (See Note 12) Commitments and Contingencies Total revenues Revenues Short-term debt, average outstanding amount Short-Term Debt, Average Outstanding Amount Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Gain on divestiture Equity Method Investment, Realized Gain (Loss) on Disposal 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] (Gains) losses on equity method investments Income (Loss) from Equity Method Investments (Decrease) in accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Amortization of deferred sales commissions Amortization of deferred sales commissions Amortization of Deferred Sales Commissions Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Other Financial Instruments, Owned, Other, at Fair Value Executive Category: Executive Category [Axis] Amortization of right-of-use assets Finance Lease, Right-of-Use Asset, Amortization 2028 Lease, Liability, Payments, Due Year Two Lease, Liability, Payments, Due Year Two Net revenues Net revenues Revenues, Net of Interest Expense (Increase) in other assets of consolidated company-sponsored investment funds Increase (Decrease) In Other Assets And Liabilities Of Investment Funds, Net Increase (Decrease) In Other Assets And Liabilities Of Investment Funds, Net AB mutual funds Accounts Payable, Other Gross Amounts Offset in the Statement of Financial Condition Security Borrowed, Subject to Master Netting Arrangement, Liability Offset Summary 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] All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Interest on lease liabilities Finance Lease, Interest Expense 2026 (excluding the six months ended June 30, 2026) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Distribution declared (in dollars per share) Distribution Made to Limited Partner, Distributions Declared, Per Unit Fair Value Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Operating and finance lease, maximum term of extension option Lessee, Lease, Maximum Term Of Extension Option Lessee, Lease, Maximum Term Of Extension Option Contribution Agreement Contribution Agreement [Member] Contribution Agreement Exchange-traded futures Foreign Exchange Future [Member] Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities PEO Name PEO Name Geographical [Axis] Geographical [Axis] Purchases of AB Holding Units for long-term incentive compensation plan awards, net Payments for Repurchase of Equity NAV Expedient Fair Value Measured at Net Asset Value Per Share [Member] Weighted average interest rates Line of Credit Facility, Interest Rate During Period Other assets Other Assets Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Acquisition-related contingent liability Business Combination, Contingent Consideration, Liability, Measurement Input Legal Entity [Axis] Legal Entity [Axis] General Partnership Interest General Partnership Interest [Member] General Partnership Interest Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Product Concentration Risk Product Concentration Risk [Member] Cash and cash equivalents as of beginning of the period Cash and cash equivalents as of end of the period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Cash collateral received Cash Collateral Cash Collateral Pledged Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Net Amount Derivative Liability, Subject to Master Netting Arrangement, after Offset and Deduction Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] 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] Business Description Organization and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Measurement Frequency [Domain] Measurement Frequency [Domain] Interest in the joint venture Equity Method Investment, Ownership Percentage Joint ventures Investment in Joint Ventures [Member] Investment in Joint Ventures Subsequent Event [Table] Subsequent Event [Table] Non-cash long-term incentive compensation expense Share-Based Payment Arrangement, Noncash Expense Employee compensation and benefits Labor and Related Expense Net lease cost Lease, Cost Limited partners: 294,295,573 and 293,508,421 units issued and outstanding Limited Partners' Capital Account Total Lease Liabilities, Payments Due [Abstract] Lease Liabilities, Payments Due [Abstract] Investment, Name [Domain] Investment, Name [Domain] Leases Lessee, Operating Leases [Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Number of distribution channels Number of Distribution Channels Number of Distribution Channels Measurement Input Type [Axis] Measurement Input Type [Axis] Distributions Made to Limited Partner [Table] Distributions Made to Limited Partner [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] LIABILITIES, REDEEMABLE NON-CONTROLLING INTEREST AND CAPITAL LIABILITIES, REDEEMABLE NON-CONTROLLING INTEREST AND CAPITAL [Abstract] Summary of Gains and Losses for Derivative Instruments Recognized in Investment Gains (Losses) Derivative Instruments, Gain (Loss) [Table Text Block] EQH Uncommitted Facility EQH Uncommitted Facility [Member] EQH Uncommitted Facility Time deposits Bank Time Deposits [Member] Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Product and Service [Axis] Product and Service [Axis] 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. Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Summary of Investment Holdings [Table] Investment Holdings [Table] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Contingent consideration liability Business Combination, Contingent Consideration, Liability Other revenues Noninterest Income, Other Operating Income, Excluding Revenue From Contract With Customer Noninterest Income, Other Operating Income, Excluding Revenue From Contract With Customer Limited Partners' Capital Account, Class [Domain] Limited Partners' Capital Account, Class [Domain] Increase (decrease) in payables Increase (Decrease) in Other Accounts Payable Operating lease cost Operating Lease, Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Reclassification Reclassification, Comparability Adjustment [Policy Text Block] Total International Non-US [Member] 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 Increase in other liabilities of consolidated company-sponsored investment funds Increase (Decrease) In Other Liabilities Of Investment Funds Increase (Decrease) In Other Liabilities Of Investment Funds Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Concentration risk Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Derivative, Name [Domain] Derivative Contract [Domain] Financial Instruments Collateral Security Borrowed, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset Equity Awards Adjustments Equity Awards Adjustments [Member] Net income per AB Unit - basic (in dollars per share) Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic, Net of Tax Total liabilities, non-controlling interest and capital Liabilities and Equity Variable lease cost Variable Lease, Cost Employee Stock Option Share-Based Payment Arrangement, Option [Member] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Industry Sector [Domain] Industry Sector [Domain] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Right-of-use assets Lease, Right-Of-Use Assets Lease, Right-Of-Use Assets Related Party [Domain] Related and Nonrelated Parties [Domain] Tabular List, Table Tabular List [Table Text Block] Summary of Unrealized Gains (Losses) Related to Equity Securities Unrealized Gain (Loss) on Investments [Table Text Block] General partners' capital account, units outstanding General Partners' Capital Account, Units Outstanding Number of deconsolidated funds Investment Deconsolidated Investment Deconsolidated 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. Name Awards Close in Time to MNPI Disclosures, Individual Name Average daily borrowings Line of Credit Facility, Average Outstanding Amount Other fees Advisory fee receivables Accrued Fees and Other Revenue Receivable Maximum incremental increase Line Of Credit Facility, Maximum Possible Aggregate Incremental Increase Line of Credit Facility, Maximum Possible Aggregate Incremental Increase 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] Summary of Redeemable Noncontrolling Interest Redeemable Noncontrolling Interest [Table Text Block] General and administrative General and Administrative Expense Total Cash Paid for Open Market Purchases of AB Holding Units Payments for Repurchase of Other Equity AB AllianceBernstein L.P. [Member] AllianceBernstein L.P. [Member] Net Amount Security Loaned, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Other equity method investments Equity Method Investments, Other [Member] Equity Method Investments, Other Adjustment to Compensation: Adjustment to Compensation [Axis] Dividend and interest income, net of broker-dealer related interest expense Interest And Dividend Income, Net, Operating Interest And Dividend Income, Net, Operating Unrealized (gains) on investments Marketable Security, Unrealized Gain (Loss) Hedging Designation [Domain] Hedging Designation [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Other commitment Other Commitment Hedging Designation [Axis] Hedging Designation [Axis] Currency forwards Foreign Exchange Forward [Member] 12b-1 fees 12b-1 Fees [Member] 12b-1 Fees [Member] Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total assets measured at fair value Assets, Fair Value Disclosure Name Measure Name Right-of-use assets obtained in exchange for lease obligations: Right Of Use Asset Obtained In Exchange For Lease Liability [Abstract] Right Of Use Asset Obtained In Exchange For Lease Liability [Abstract] Net Amount Security Borrowed, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Foreign currency translation adjustments, before tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other, net Other Noncash Income (Expense) Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Company-Sponsored Investment Funds Consolidated Investment Portfolios [Member] Consolidated Investment Portfolios [Member] Redeemable Noncontrolling Interest [Roll Forward] Redeemable Noncontrolling Interest [Roll Forward] Redeemable Noncontrolling Interest Entity Filer Category Entity Filer Category Capital contributions (to) from AB Holding Capital Contributions Received From (Paid to) Related Parties Capital Contributions Received From (Paid to) Related Parties 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 Total revenue not from contract with customer Revenue Not from Contract with Customer Summary of Offsetting of Financial Liabilities Summary of Offsetting of Derivative Liabilities Offsetting Liabilities [Table Text Block] Cash and Securities Segregated Under Federal Regulations and Other Requirements Restricted Assets Disclosure [Text Block] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent General Partner’s Capital General Partner [Member] Financing Leases Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Non-cash lease expense Operating Lease, Expense Luxembourg LUXEMBOURG Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Unrealized gains (losses) recognized during the period on equity securities held Equity Securities, FV-NI, Unrealized Gain (Loss) Long-term incentive compensation plans activity Partners' Capital Account, Deferred Compensation Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Total return swaps Total Return Swap [Member] Net income Net income Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Finance leases Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Capital contributions (to) AB Holding Payments of Distributions to Affiliates Statement of Partners' Capital [Abstract] Statement of Partners' Capital [Abstract] Operating leases Operating Lease, Weighted Average Remaining Lease Term Derivative Liabilities Derivatives Derivative Liability Non-PEO NEO Non-PEO NEO [Member] Thereafter Finance Lease, Liability, To Be Paid, After Year Four Finance Lease, Liability, To Be Paid, After Year Four Entity Address, Address Line One Entity Address, Address Line One Operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Excluding Company-Sponsored Investment Funds Excluding Company-Sponsored Investment Funds [Member] Excluding Company-Sponsored Investment Funds North America North America [Member] Income taxes Income Tax Expense (Benefit) Other assets Other assets Other Assets Of Investment Funds Other Assets Of Investment Funds 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 Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Distribution-related payments Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Weighted average limited partnership Units outstanding – basic (in shares) Weighted Average Limited Partnership Units Outstanding, Basic Principles of Consolidation Consolidation, Policy [Policy Text Block] Net increase in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] VIEs Variable Interest Entity, Primary Beneficiary [Member] Net income attributable to AB Unitholders Net income attributable to AB Unitholders Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] AB AllianceBernstein Corporation [Member] AllianceBernstein Corporation [Member] Other Other Equity Securities [Member] Other Equity Securities [Member] Cash Collateral Security Borrowed, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Receivables, net: Receivables, Net, Current [Abstract] (Increase) decrease in receivables Increase (Decrease) in Receivables Revaluation of AB Holding Units held in rabbi trust Re-Valuation Of Holding Units Held In Trust Re-Valuation Of Holding Units Held In Trust Gross Amounts of Recognized Assets Gross Amounts of Recognized Assets Derivative Asset, Subject to Master Netting Arrangement, before Offset Condensed Balance Sheet Statements, Captions [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Japan JAPAN Gross Amounts Offset in the Statement of Financial Condition Security Loaned, Subject to Master Netting Arrangement, Asset Offset Revenues: Revenues [Abstract] 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 Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]