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Business Description, Organization and Basis of Presentation - Limited Partnership Interests in AB Holdings (Details) - AllianceBernstein Corporation	9 Months Ended
	Sep. 30, 2025
EQH and its subsidiaries
Distribution Made to Limited Partner [Line Items]
Limited partners or members ownership interest in company (as a percent)	68.50%
AB Holding
Distribution Made to Limited Partner [Line Items]
Limited partners or members ownership interest in company (as a percent)	30.80%
Unaffiliated holders
Distribution Made to Limited Partner [Line Items]
Limited partners or members ownership interest in company (as a percent)	0.70%
AB
Distribution Made to Limited Partner [Line Items]
Limited partners or members ownership interest in company (as a percent)	100.00%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482987/272-10-50-3

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