CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
REVENUES
Total revenues	$ 7,886	$ 8,792	$ 24,515	$ 25,269
COSTS AND EXPENSES
Purchases and related costs	6,855	7,768	21,218	22,838
Field operating costs	316	326	983	931
General and administrative expenses	75	75	229	235
Depreciation and amortization	157	129	441	386
(Gains)/losses on asset sales and asset impairments, net	(7)	2	(7)	(79)
Total costs and expenses	7,396	8,300	22,864	24,311
OPERATING INCOME	490	492	1,651	958
OTHER INCOME/(EXPENSE)
Equity earnings in unconsolidated entities	102	110	274	281
Gain on investment in unconsolidated entities	4	210	271	210
Interest expense (net of capitalized interest of $7, $8, $29 and $21, respectively)	(108)	(110)	(311)	(327)
Other income/(expense), net	5	(3)	23	8
INCOME BEFORE TAX	493	699	1,908	1,130
Current income tax expense	(19)	(14)	(72)	(34)
Deferred income tax expense	(43)	(9)	(65)	(50)
NET INCOME	431	676	1,771	1,046
Net income attributable to noncontrolling interests	(361)	(565)	(1,488)	(892)
NET INCOME ATTRIBUTABLE TO PAGP	$ 70	$ 111	$ 283	$ 154
Class A Shares
OTHER INCOME/(EXPENSE)
BASIC NET INCOME PER CLASS A SHARE (in dollars per share)	$ 0.41	$ 0.70	$ 1.73	$ 0.98
DILUTED NET INCOME PER CLASS A SHARE (in dollars per share)	$ 0.41	$ 0.70	$ 1.72	$ 0.98
BASIC WEIGHTED AVERAGE CLASS A SHARES OUTSTANDING (in shares)	168	158	163	157
DILUTED WEIGHTED AVERAGE CLASS A SHARES OUTSTANDING (in shares)	168	158	165	157
Supply and Logistics
REVENUES
Total revenues	$ 7,541	$ 8,482	$ 23,477	$ 24,374
Transportation
REVENUES
Total revenues	196	161	581	458
OTHER INCOME/(EXPENSE)
Equity earnings in unconsolidated entities	102	110	274	281
Facilities
REVENUES
Total revenues	$ 149	$ 149	$ 457	$ 437