Operating Segments - Reconciliation of Segment Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting, Reconciling Item from Segments to Consolidated [Line Items]
Segment adjusted EBITDA	$ 489	$ 462	$ 1,451	$ 1,568
Adjustments:
Depreciation and amortization of unconsolidated entities	(13)	(13)	(31)	(38)
Gains/(losses) from derivative activities net of inventory valuation adjustments	(216)	52	86	(189)
Long-term inventory costing adjustments	16	(38)	2	6
Deficiencies under minimum volume commitments, net	(8)	(25)	(5)	(59)
Equity-indexed compensation expense	(7)	(8)	(18)	(23)
Net gain/(loss) on foreign currency revaluation	14	(2)	27	(4)
Significant acquisition-related expenses			(6)
Unallocated general and administrative expenses	(68)	(71)	(213)	(212)
Depreciation and amortization	(152)	(33)	(403)	(352)
Interest expense, net	(134)	(116)	(390)	(349)
Other income/(expense), net	(1)	17	(6)	46
INCOME/(LOSS) BEFORE TAX	(12)	295	692	604
Income tax benefit/(expense)	43	(16)	(85)	(66)
NET INCOME	31	279	607	538
Net income attributable to noncontrolling interests	(27)	(255)	(538)	(436)
NET INCOME ATTRIBUTABLE TO PAGP	$ 4	24	69	102
Unallocated
Adjustments:
Unallocated general and administrative expenses		$ (1)	(3)	$ (2)
Line 901 Incident
Adjustments:
Line 901 incident			$ (12)

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.