CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income/(loss)	$ 1,163	$ 600	$ (2,440)
Other comprehensive income/(loss)	(101)	65	15
Comprehensive income/(loss)	1,062	665	(2,425)
Comprehensive (income)/loss attributable to noncontrolling interests	(922)	(588)	1,863
Comprehensive income/(loss) attributable to PAGP	$ 140	$ 77	$ (562)