Operating Segments - Segment Adjusted EBITDA Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Segment Reporting, Reconciling Item from Segments to Consolidated [Line Items]
Segment Adjusted EBITDA	$ 546	$ 793
Adjustments:
Depreciation and amortization of unconsolidated entities	(20)	(17)
Gains/(losses) from derivative activities and inventory valuation adjustments	198	(30)
Long-term inventory costing adjustments	41	(115)
Deficiencies under minimum volume commitments, net	32	2
Equity-indexed compensation expense	(5)	(4)
Net gain on foreign currency revaluation	1	13
Significant acquisition-related expenses		(3)
Unallocated general and administrative expenses	(68)	(70)
Depreciation and amortization	(178)	(169)
Gains/(losses) on asset sales and asset impairments, net	(2)	(619)
Goodwill impairment losses	0	(2,515)
Gain on/(impairment of) investments in unconsolidated entities, net	0	(22)
Interest expense, net	(107)	(108)
Other expense, net	(60)	(31)
INCOME/(LOSS) BEFORE TAX	445	(2,826)
Income tax (expense)/benefit	(53)	134
NET INCOME/(LOSS)	392	(2,692)
Net (income)/loss attributable to noncontrolling interests	(322)	2,111
NET INCOME/(LOSS) ATTRIBUTABLE TO PAGP	70	(581)
Unallocated
Adjustments:
Unallocated general and administrative expenses	$ (1)	$ (1)

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.