CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income/(loss)	$ 648	$ (2,580)	$ 2,180
Other comprehensive income	65	15	97
Comprehensive income/(loss)	713	(2,565)	2,277
Comprehensive income attributable to noncontrolling interests	(55)	(10)	(9)
Comprehensive income/(loss) attributable to PAA	$ 658	$ (2,575)	$ 2,268