CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
REVENUES
Total revenues	$ 3,225	$ 8,253	$ 11,494	$ 16,628
COSTS AND EXPENSES
Purchases and related costs	2,525	7,244	9,893	14,362
Field operating costs	253	340	557	667
General and administrative expenses	74	76	144	154
Depreciation and amortization	166	148	335	284
(Gains)/losses on asset sales and asset impairments, net (Note 14)	(1)	(4)	618	0
Goodwill impairment losses (Note 6)	0		2,515
Total costs and expenses	3,017	7,804	14,062	15,467
OPERATING INCOME/(LOSS)	208	449	(2,568)	1,161
OTHER INCOME/(EXPENSE)
Equity earnings in unconsolidated entities	81	83	191	172
Gain on/(impairment of) investments in unconsolidated entities, net (Note 7)	(69)		(91)	267
Interest expense (net of capitalized interest of $5, $11, $11 and $22, respectively)	(108)	(103)	(215)	(203)
Other income/(expense), net	18	(6)	(13)	18
INCOME/(LOSS) BEFORE TAX	130	423	(2,696)	1,415
Current income tax expense	(15)	(24)	(22)	(53)
Deferred income tax (expense)/benefit	22	27	162	(22)
NET INCOME/(LOSS)	137	426	(2,556)	1,340
Net (income)/loss attributable to noncontrolling interests	(121)	(360)	1,991	(1,127)
NET INCOME/(LOSS) ATTRIBUTABLE TO PAGP	$ 16	$ 66	$ (565)	$ 213
Class A Shares
OTHER INCOME/(EXPENSE)
BASIC NET INCOME/(LOSS) PER CLASS A SHARE (in dollars per share)	$ 0.09	$ 0.41	$ (3.08)	$ 1.32
DILUTED NET INCOME/(LOSS) PER CLASS A SHARE (IN DOLLARS PER SHARE)	$ 0.09	$ 0.40	$ (3.08)	$ 1.32
BASIC WEIGHTED AVERAGE CLASS A SHARES OUTSTANDING (in shares)	184,000	162,000	183,000	161,000
DILUTED WEIGHTED AVERAGE CLASS A SHARES OUTSTANDING (in shares)	184,000	164,000	183,000	161,000
Supply and Logistics
REVENUES
Total revenues	$ 2,925	$ 7,914	$ 10,833	$ 15,936
Transportation
REVENUES
Total revenues	151	188	338	385
OTHER INCOME/(EXPENSE)
Equity earnings in unconsolidated entities	81	83	189	172
Facilities
REVENUES
Total revenues	$ 149	$ 151	323	$ 307
OTHER INCOME/(EXPENSE)
Equity earnings in unconsolidated entities			$ 2