Operating Segments (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reconciliation of segment profit to net income attributable to Plains
Segment profit	$ 487	$ 530	$ 1,371	$ 1,627
Unallocated general and administrative expenses		(1)	(2)	(3)
Depreciation and amortization	(110)	(97)	(327)	(294)
Interest expense, net	(110)	(88)	(322)	(254)
Other expense, net	(4)	(4)	(7)	(2)
INCOME BEFORE TAX	263	340	713	1,074
Income tax expense	(35)	(29)	(120)	(116)
NET INCOME	228	311	593	958
Net income attributable to noncontrolling interests	(196)	(295)	(500)	(913)
NET INCOME ATTRIBUTABLE TO PAGP	$ 32	$ 16	$ 93	$ 45