Business Description, Organization and Basis of Presentation - Limited Partnership Interests in AB Holdings (Details) - AllianceBernstein Corporation	9 Months Ended
	Sep. 30, 2023
EQH and its subsidiaries
Distribution Made to Limited Partner [Line Items]
Limited partners or members ownership interest in Company (percent)	60.30%
AB Holding
Distribution Made to Limited Partner [Line Items]
Limited partners or members ownership interest in Company (percent)	39.00%
Unaffiliated holders
Distribution Made to Limited Partner [Line Items]
Limited partners or members ownership interest in Company (percent)	0.70%
AB
Distribution Made to Limited Partner [Line Items]
Limited partners or members ownership interest in Company (percent)	100.00%