Business Description and Organization - Summary of Ownership Structure (Details)	12 Months Ended
	Dec. 31, 2024
AB
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)	61.90%
AB Holding
Ownership structure of AB Holding
Limited partners or members ownership interest in company (percent)	37.50%
Unaffiliated holders
Ownership structure of AB Holding
Limited partners or members ownership interest in company (percent)	0.60%