CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
REVENUES
Total revenues	$ 8,269	$ 8,375
COSTS AND EXPENSES
Purchases and related costs	7,367	7,119
Field operating costs	304	326
General and administrative expenses	70	77
Depreciation and amortization	169	136
(Gains)/losses on asset sales and asset impairments, net (Note 14)	619	4
Goodwill impairment losses (Note 6)	2,515
Total costs and expenses	11,044	7,662
OPERATING INCOME/(LOSS)	(2,775)	713
OTHER INCOME/(EXPENSE)
Equity earnings in unconsolidated entities	110	89
Gain on/(impairment of) investments in unconsolidated entities, net (Note 7)	(22)	267
Interest expense (net of capitalized interest of $6 and $11, respectively)	(108)	(101)
Other income/(expense), net	(31)	25
INCOME/(LOSS) BEFORE TAX	(2,826)	993
Current income tax expense	(6)	(30)
Deferred income tax (expense)/benefit	140	(49)
NET INCOME/(LOSS)	(2,692)	914
Net (income)/loss attributable to noncontrolling interests	2,111	(767)
NET INCOME/(LOSS) ATTRIBUTABLE TO PAGP	$ (581)	$ 147
Class A Shares
OTHER INCOME/(EXPENSE)
BASIC AND DILUTED NET INCOME/(LOSS) PER CLASS A SHARE (in dollars per share)	$ (3.18)	$ 0.92
BASIC AND DILUTED WEIGHTED AVERAGE CLASS A SHARES OUTSTANDING (IN SHARES)	183	159
Supply and Logistics
REVENUES
Total revenues	$ 7,907	$ 8,022
Transportation
REVENUES
Total revenues	187	197
OTHER INCOME/(EXPENSE)
Equity earnings in unconsolidated entities	108	89
Facilities
REVENUES
Total revenues	175	$ 156
OTHER INCOME/(EXPENSE)
Equity earnings in unconsolidated entities	$ 2