Business Description, Organization and Basis of Presentation - Summary of Ownership Structure (Details) - AB	6 Months Ended
Jun. 30, 2026
Distribution Made to Limited Partner [Line Items]
Limited partners or members ownership interest in company	100.00%
EQH and its subsidiaries
Distribution Made to Limited Partner [Line Items]
Limited partners or members ownership interest in company	68.00%
AB Holding
Distribution Made to Limited Partner [Line Items]
Limited partners or members ownership interest in company	31.30%
Unaffiliated holders
Distribution Made to Limited Partner [Line Items]
Limited partners or members ownership interest in company	0.70%

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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-5

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480100/505-10-S45-8

Name:	us-gaap_DistributionMadeToLimitedPartnerLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration