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Business Description, Organization and Basis of Presentation - Narrative (Details) - shares |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 10, 2025 | Sep. 30, 2025 | Jul. 09, 2025 | Dec. 31, 2024
Ownership structure of AB Holding |  |  |  |
Units outstanding (in shares) |  | 100,000 |  | 100,000
Beneficial ownership of AB Holding units (in shares) |  | 20,833,912 |  |
Master Exchange Agreement |  |  |  |
Ownership structure of AB Holding |  |  |  |
Remaining authorized shares (in shares) | 19,682,946 |  | 4,788,806 |
AB Holding Units | Amended Exchange Agreement | EQH |  |  |  |
Ownership structure of AB Holding |  |  |  |
Beneficial ownership of AB Holding units (in shares) | 19,682,946 |  |  |
AB Units | Amended Exchange Agreement | EQH |  |  |  |
Ownership structure of AB Holding |  |  |  |
Conversion of AB units (in shares) | 19,682,946 |  |  |
AB Holding | AllianceBernstein Corporation | General Partnership Interest |  |  |  |
Ownership structure of AB Holding |  |  |  |
Units outstanding (in shares) |  | 100,000 |  |
AB |  |  |  |
Ownership structure of AB Holding |  |  |  |
Economic interest, percentage |  | 68.50% |  |
AB | AllianceBernstein Corporation | General Partnership Interest |  |  |  |
Ownership structure of AB Holding |  |  |  |
General partnership interest (as a percent) |  | 1.00% |  |

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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-5 + Details
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