Business Description Organization and Basis of Presentation (Details)	3 Months Ended
	Mar. 31, 2019 shares
General partnership information [Abstract]
General partnership interest in Company (percent)	1.00%
AB
General partnership information [Abstract]
Limited partners or members ownership interest in company (percent)	100.00%
EQH | AXA
General partnership information [Abstract]
General partnership interest in Company (percent)	48.30%
AB Holding | EQH
General partnership information [Abstract]
General partnership interest in Company (percent)	4.20%
AB Holding | AB
General partnership information [Abstract]
General partnership interest in Company (percent)	1.00%
General Partnership number of general partnership units owned in Holding Company (in units)	100,000
Limited partners or members ownership interest in company (percent)	35.20%
EQH and its subsidiaries | AB
General partnership information [Abstract]
Limited partners or members ownership interest in company (percent)	64.00%
Unaffiliated holders | AB
General partnership information [Abstract]
Limited partners or members ownership interest in company (percent)	0.80%
AB | EQH and its subsidiaries
General partnership information [Abstract]
General partnership interest in Company (percent)	65.60%