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Net Income/(Loss) Per Class A Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Basic and Diluted Net Income/(Loss) per Class A Share
Net income/(loss) attributable to PAGP	$ 70	$ (581)
AAP Units
Net Income Per Class A Share
Antidilutive securities excluded from computation of earnings per share (per share)	51.0	63.0
AAP Management Units
Net Income Per Class A Share
Antidilutive securities excluded from computation of earnings per share (per share)	1.0	1.0
Class A Shares
Basic and Diluted Net Income/(Loss) per Class A Share
Basic and diluted weighted average Class A shares outstanding (in shares)	194.0	183.0
Basic and diluted net income/(loss) per Class A share (in dollars per share)	$ 0.36	$ (3.18)
Maximum
Net Income Per Class A Share
Dilutive LTIP awards (shares)	0.1

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