CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income/(loss)	$ 144	$ 448	$ (2,701)	$ 1,418
Other comprehensive income/(loss)	116	51	(212)	109
Comprehensive income/(loss)	260	499	(2,913)	1,527
Comprehensive income attributable to noncontrolling interests	(2)	(2)	(4)	(2)
Comprehensive income/(loss) attributable to PAA	$ 258	$ 497	$ (2,917)	$ 1,525