Business Description Organization and Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The interim condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”). In the opinion of management, all adjustments, consisting only of normal recurring adjustments, necessary for a fair statement of the interim results, have been made. The preparation of the condensed consolidated financial statements requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the dates of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the interim reporting periods. Actual results could differ from those estimates. The condensed consolidated statement of financial condition as of December 31, 2021 was derived from audited financial statements. Certain disclosures included in the annual financial statements have been condensed or omitted from these financial statements as they are not required for interim financial statements under principles generally accepted in the United States of America ("GAAP") and the rules of the SEC.
Principles of Consolidation	Principles of Consolidation The condensed consolidated financial statements include AB and its majority-owned and/or controlled subsidiaries, and the consolidated entities that are considered to be variable interest entities (“VIEs”) and/or voting interest entities (“VOEs”) in which AB has a controlling financial interest. Non-controlling interests on the condensed consolidated statements of financial condition include the portion of consolidated company-sponsored investment funds in which we do not have direct equity ownership. All significant inter-company transactions and balances among the consolidated entities have been eliminated.
Reclassifications	ReclassificationsCertain prior period amounts have been reclassified to conform to the current period's presentation. Amounts previously presented on the Statement of Cash Flows as (increase) decrease in right-of-use assets and increase (decrease) in lease liabilities during 2021 are now presented net as "Cash payments to relieve operating lease liabilities". Non-cash lease expense under adjustments to reconcile net income to net cash provided by operating activities formerly classified as "Depreciation and other amortization" during 2021 are now classified separately on the Statement of Cash Flows as "Non-cash lease expense". Amounts previously classified under Financing "Other" related to non-cash accretion expense associated with our contingent payment arrangements during 2021 have been reclassified to non-cash "Other, net" under adjustments to reconcile net income to net cash provided by operating activities.
Subsequent Events	Subsequent EventsWe have evaluated subsequent events through the date that these financial statements were filed with the SEC. See Note 17 Subsequent Event for additional details related to the closing of our acquisition of CarVal Investors, L.P. ("CarVal"). We previously announced our intention to acquire CarVal in our Form 10-Q for the quarter ended March 31, 2022.