Units Outstanding (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Changes in Limited Partnership Units Outstanding
Outstanding, beginning balance (in units)	270,509,658	270,380,314
Options exercised (in units)	143,211	5,182
Units issued (in units)	3,917,437	3,363,132
Units retired (in units)	(3,117,263)	(3,238,970)
Outstanding, ending balance (in units)	271,453,043	270,509,658
AB Units
Changes in Limited Partnership Units Outstanding
Units retired (in units)	(5,400)	(1,500)