Business Description, Organization and Basis of Presentation - Summary of Ownership Structure (Details) - AB	3 Months Ended
	Mar. 31, 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	31.40%
Unaffiliated holders
Distribution Made to Limited Partner [Line Items]
Limited partners or members ownership interest in company	0.60%