CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
REVENUES
Total revenues	$ 5,833	$ 7,886	$ 17,327	$ 24,515
COSTS AND EXPENSES
Purchases and related costs	5,107	6,855	15,000	21,218
Field operating costs	254	316	811	983
General and administrative expenses	62	75	206	229
Depreciation and amortization	161	157	495	441
(Gains)/losses on asset sales and asset impairments, net (Note 14)	(2)	(7)	617	(7)
Goodwill impairment losses (Note 6)	0	0	2,515	0
Total costs and expenses	5,582	7,396	19,644	22,864
OPERATING INCOME/(LOSS)	251	490	(2,317)	1,651
OTHER INCOME/(EXPENSE)
Equity earnings in unconsolidated entities	89	102	280	274
Gain on/(impairment of) investments in unconsolidated entities, net (Note 7)	(91)	4	(182)	271
Interest expense (net of capitalized interest of $6, $7, $17 and $29, respectively)	(113)	(108)	(329)	(311)
Other income/(expense), net	5	5	(7)	23
INCOME/(LOSS) BEFORE TAX	141	493	(2,555)	1,908
Current income tax expense	(17)	(19)	(39)	(72)
Deferred income tax (expense)/benefit	15	(43)	177	(65)
NET INCOME/(LOSS)	139	431	(2,417)	1,771
Net (income)/loss attributable to noncontrolling interests	(122)	(361)	1,869	(1,488)
NET INCOME/(LOSS) ATTRIBUTABLE TO PAGP	$ 17	$ 70	$ (548)	$ 283
Class A Shares
OTHER INCOME/(EXPENSE)
BASIC NET INCOME/(LOSS) PER CLASS A SHARE	$ 0.09	$ 0.41	$ (2.97)	$ 1.73
DILUTED NET INCOME/(LOSS) PER CLASS A SHARE	$ 0.09	$ 0.41	$ (2.97)	$ 1.72
BASIC WEIGHTED AVERAGE CLASS A SHARES OUTSTANDING	186	168	184	163
DILUTED WEIGHTED AVERAGE CLASS A SHARES OUTSTANDING	186	168	184	165
Supply and Logistics
REVENUES
Total revenues	$ 5,537	$ 7,541	$ 16,370	$ 23,477
Transportation
REVENUES
Total revenues	146	196	484	581
OTHER INCOME/(EXPENSE)
Equity earnings in unconsolidated entities	87	102	276	274
Facilities
REVENUES
Total revenues	150	$ 149	473	$ 457
OTHER INCOME/(EXPENSE)
Equity earnings in unconsolidated entities	$ 2		$ 4