Business Description and Organization - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018 shares
Ownership structure of AB expressed as percentage of general and limited partnership interests
Percentage of General Partnership interest in company	1.00%
General Partnership number of general partnership units owned in Holding Company (in units)	100,000
AXA and its subsidiaries economic interest in Company	65.20%
AXA | EQH
Ownership structure of AB expressed as percentage of general and limited partnership interests
Percentage of General Partnership interest in company	59.20%
EQH | AB Holding
Ownership structure of AB expressed as percentage of general and limited partnership interests
Percentage of General Partnership interest in company	4.20%