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Net Income/(Loss) Per Class A Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Basic and Diluted Net Income/(Loss) per Class A Share
Net income/(loss) attributable to PAGP	$ 31	$ (69)	$ 53	$ 1
Maximum
Net Income Per Class A Share
Dilutive LTIP awards (shares)	0.1		0.1	0.1
AAP Units
Net Income Per Class A Share
Antidilutive securities excluded from computation of earnings per share (shares)	47.0	51.0	47.0	51.0
AAP Management Units | Maximum
Net Income Per Class A Share
Antidilutive securities excluded from computation of earnings per share (shares)	1.0	1.0	1.0	1.0
Class A Shares
Basic and Diluted Net Income/(Loss) per Class A Share
Basic weighted average Class A shares outstanding (shares)	194.0	194.0	194.0	194.0
Diluted weighted average Class A shares outstanding (shares)	194.0	194.0	194.0	194.0
Basic net income/(loss) per Class A share (usd per share)	$ 0.16	$ (0.35)	$ 0.27	$ 0
Diluted net income/(loss) per Class A share (usd per share)	$ 0.16	$ (0.35)	$ 0.27	$ 0

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