CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 333	$ 239	$ 776	$ 448
Other comprehensive income/(loss)	85	(52)	85	22
Comprehensive income	418	187	861	470
Comprehensive income attributable to noncontrolling interests	(346)	(170)	(720)	(411)
Comprehensive income attributable to PAGP	$ 72	$ 17	$ 141	$ 59