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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income/(loss)	$ 392	$ (2,692)
Other comprehensive income/(loss)	108	(327)
Comprehensive income/(loss)	500	(3,019)
Comprehensive (income)/loss attributable to noncontrolling interests	(401)	2,356
Comprehensive income/(loss) attributable to PAGP	$ 99	$ (663)

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