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Segment Information - Segment Adjusted EBITDA Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting, Reconciling Item from Segments to Consolidated [Line Items]
Segment Adjusted EBITDA	$ 614	$ 574	$ 1,227	$ 1,117
Adjustments:
Depreciation and amortization of unconsolidated entities	(17)	(68)	(37)	(88)
Gains/(losses) from derivative activities and inventory valuation adjustments	75	(163)	(13)	35
Long-term inventory costing adjustments	13	27	105	68
Deficiencies under minimum volume commitments, net	(10)	(6)	(15)	26
Equity-indexed compensation expense	(7)	(4)	(15)	(9)
Net gain/(loss) on foreign currency revaluation	(3)	1	(1)	2
Significant transaction-related expenses		(3)		(3)
Adjusted EBITDA attributable to noncontrolling interests in consolidated joint ventures	89	4	166	7
Unallocated general and administrative expenses	(80)	(74)	(163)	(142)
Depreciation and amortization	(243)	(197)	(475)	(375)
Gains/(losses) on asset sales and asset impairments, net	3	(369)	46	(370)
Interest expense, net	(99)	(107)	(206)	(213)
Other income/(expense), net	(118)	84	(155)	23
INCOME/(LOSS) BEFORE TAX	295	(229)	539	217
Income tax (expense)/benefit	(56)	17	(91)	(36)
NET INCOME/(LOSS)	239	(212)	448	181
Net (income)/loss attributable to noncontrolling interests	(208)	143	(395)	(180)
NET INCOME/(LOSS) ATTRIBUTABLE TO PAGP	31	(69)	53	1
Unallocated
Adjustments:
Unallocated general and administrative expenses	$ (2)	$ (2)	(3)	$ (3)
Line 901 Incident
Adjustments:
Line 901 incident			$ (85)

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