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Net Income/(Loss) Per Class A Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Basic Net Income/(Loss) per Class A Share
Net income/(loss) attributable to PAGP	$ (20)	$ 17	$ 16	$ (581)	$ 48	$ 70	$ 66	$ 147	$ (568)	$ 331	$ 334
Diluted Net Income/(Loss) per Class A Share
Net income attributable to PAGP	$ (20)	$ 17	$ 16	$ (581)	$ 48	$ 70	$ 66	$ 147	(568)	331	334
Incremental net income/(loss) attributable to PAGP resulting from assumed exchange of AAP units and AAP Management Units									(189)	2	262
Net income/(loss) attributable to PAGP including incremental net income/(loss) from assumed exchange of AAP units and AAP Management Units									$ (757)	$ 333	$ 596
AAP Units
Basic and diluted earnings per share
Antidilutive securities excluded from computation of earnings per share (per share)										99.0
AAP Management Units
Basic and diluted earnings per share
Antidilutive securities excluded from computation of earnings per share (per share)									1.0
Class A Shares
Basic Net Income/(Loss) per Class A Share
Basic weighted average Class A shares outstanding (in shares)									186.0	168.0	158.0
Basic net income/(loss) per Class A share (in dollars per share)	$ (0.11)	$ 0.09	$ 0.09	$ (3.18)	$ 0.26	$ 0.41	$ 0.41	$ 0.92	$ (3.06)	$ 1.97	$ 2.12
Diluted Net Income/(Loss) per Class A Share
Basic weighted average Class A shares outstanding (in shares)									186.0	168.0	158.0
Dilutive shares resulting from assumed exchange of AAP units and AAP Management Units (in shares)									60.0	2.0	124.0
Diluted weighted average Class A shares outstanding (in shares)									246.0	170.0	282.0
Diluted net income/(loss) per Class A share (in dollars per share)	$ (0.11)	$ 0.09	$ 0.09	$ (3.18)	$ 0.26	$ 0.41	$ 0.40	$ 0.92	$ (3.07)	$ 1.96	$ 2.11
Maximum
Basic and diluted earnings per share
Dilutive awards (less than) (in shares)										0.1	0.1

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