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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income/(loss)	$ (2,440)	$ 2,062	$ 2,107
Other comprehensive income/(loss)	15	97	(260)
Comprehensive income/(loss)	(2,425)	2,159	1,847
Comprehensive (income)/loss attributable to noncontrolling interests	1,863	(1,805)	(1,570)
Comprehensive income/(loss) attributable to PAGP	$ (562)	$ 354	$ 277

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