Segment Information - Segment Adjusted EBITDA Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting, Reconciling Item from Segments to Consolidated
Segment Adjusted EBITDA	$ 591	$ 614	$ 1,300	$ 1,227
Adjustments:
Depreciation and amortization of unconsolidated entities	(24)	(17)	(47)	(37)
Derivative activities and inventory valuation adjustments	86	75	(6)	(13)
Long-term inventory costing adjustments	(2)	13	(31)	105
Deficiencies under minimum volume commitments, net	2	(10)	9	(15)
Equity-indexed compensation expense	(8)	(7)	(17)	(15)
Foreign currency revaluation	(19)	(3)	(15)	(1)
Adjusted EBITDA attributable to noncontrolling interests in consolidated joint ventures	103	89	200	166
Unallocated general and administrative expenses	(87)	(80)	(174)	(163)
Depreciation and amortization	(260)	(243)	(517)	(475)
Gains/(losses) on asset sales and asset impairments, net	(3)	3	150	46
Interest expense, net	(95)	(99)	(193)	(206)
Other income/(expense), net	20	(118)	85	(155)
INCOME BEFORE TAX	389	295	915	539
Income tax expense	(56)	(56)	(139)	(91)
NET INCOME	333	239	776	448
Net income attributable to noncontrolling interests	(285)	(208)	(659)	(395)
NET INCOME ATTRIBUTABLE TO PAGP	48	31	117	53
Unallocated
Adjustments:
Unallocated general and administrative expenses	$ (2)	$ (2)	(3)	(3)
Line 901 Incident
Adjustments:
Line 901 incident			$ 0	$ (85)

Adjusted EBITDA Attributable To Noncontrolling Interests In Consolidated Joint Ventures

No definition available.

Name:	pagp_AdjustedEBITDAAttributableToNoncontrollingInterestsInConsolidatedJointVentures
Namespace Prefix:	pagp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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.

+ References

No definition available.