Operating Segments - Segment Adjusted EBITDA Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting, Reconciling Item from Segments to Consolidated [Line Items]
Segment Adjusted EBITDA	$ 578	$ 523	$ 1,124	$ 1,316
Adjustments:
Depreciation and amortization of unconsolidated entities	(68)	(16)	(88)	(33)
Gains/(losses) from derivative activities and inventory valuation adjustments	(163)	(90)	35	(121)
Long-term inventory costing adjustments	27	51	68	(64)
Deficiencies under minimum volume commitments, net	(6)	(7)	26	(6)
Equity-indexed compensation expense	(4)	(5)	(9)	(8)
Net gain on foreign currency revaluation	1		2	13
Significant transaction-related expenses	(3)		(3)	(3)
Unallocated general and administrative expenses	(74)	(74)	(142)	(144)
Depreciation and amortization	(197)	(166)	(375)	(335)
Gains/(losses) on asset sales and asset impairments, net	(369)	1	(370)	(618)
Goodwill impairment losses				(2,515)
Gain on/(impairment of) investments in unconsolidated entities, net		(69)		(91)
Interest expense, net	(107)	(108)	(213)	(215)
Other income/(expense), net	84	18	23	(13)
INCOME/(LOSS) BEFORE TAX	(229)	130	217	(2,696)
Income tax (expense)/benefit	17	7	(36)	140
NET INCOME/(LOSS)	(212)	137	181	(2,556)
Net (income)/loss attributable to noncontrolling interests	143	(121)	(180)	1,991
NET INCOME/(LOSS) ATTRIBUTABLE TO PAGP	(69)	16	1	(565)
Unallocated
Adjustments:
Unallocated general and administrative expenses	$ (2)	$ (2)	$ (3)	$ (3)

Includes the impact of amounts billed to counterparties for their deficiency obligation, net of applicable amounts subsequently recognized into revenue. Certain agreements require counterparties to deliver, transport or throughput a minimum volume over an agreed upon period. Substantially all of such agreements were entered into with counterparties to economically support the return on the reporting entity's capital expenditure necessary to construct the related asset. Some of these agreements include make-up rights if the minimum volume is not met. A receivable from the counterparty is recorded in the period that services are provided or when the transaction occurs, including amounts for deficiency obligations from counterparties associated with minimum volume commitments. If a counterparty has a make-up right associated with a deficiency, the revenue attributable to the counterparty’s make-up right is deferred and is subsequently recognized at the earlier of when the deficiency volume is delivered or shipped, when the make-up right expires or when it is determined that the counterparty’s ability to utilize the make-up right is remote.

No definition available.