Business Description and Organization - Summary of Ownership Structure (Details)	12 Months Ended
	Dec. 31, 2021
AllianceBernstein Corporation
Ownership structure of AB Holding
Limited partners or members ownership interest in Company (percent)	100.00%
EQH and its subsidiaries
Ownership structure of AB Holding
Limited partners or members ownership interest in Company (percent)	63.00%
AB Holding
Ownership structure of AB Holding
Limited partners or members ownership interest in Company (percent)	36.20%
Unaffiliated holders
Ownership structure of AB Holding
Limited partners or members ownership interest in Company (percent)	0.80%