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Business Description, Organization and Basis of Presentation - Narrative (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Ownership structure of AB Holding
Units outstanding (in shares)	100,000		100,000		100,000
AB Holding units repurchased (in shares)	400,000	900,000	1,200,000	1,000,000.0
Tender Offer
Ownership structure of AB Holding
Cash tender offer to purchase up to (in shares)	46,000,000		46,000,000
AB Holding units repurchased (in shares)	19,682,946
AB Holding
Ownership structure of AB Holding
Economic interest, percentage	17.90%		17.90%
AB Holding | AllianceBernstein Corporation | General Partnership Interest
Ownership structure of AB Holding
Units outstanding (in shares)	100,000		100,000
AB
Ownership structure of AB Holding
Economic interest, percentage	68.60%		68.60%
AB | AllianceBernstein Corporation | General Partnership Interest
Ownership structure of AB Holding
General partnership interest (as a percent)			1.00%

X

- Definition

Number of shares authorized to be purchased under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
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-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org/1943274/2147481520/505-30-50-4

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The number of general partner units outstanding.

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- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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