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Operating Segments (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Reconciliation of segment profit to net income attributable to Plains        
Segment profit $ 530 $ 408 $ 1,627 $ 1,640
Unallocated general and administrative expenses (1)   (3)  
Depreciation and amortization (97) (93) (294) (266)
Interest expense, net (88) (73) (254) (227)
Other income/(expense), net (4) 3 (2) 2
INCOME BEFORE TAX 340 245 1,074 1,149
Income tax expense (29) (9) (116) (79)
NET INCOME 311 236 958 1,070
Net income attributable to noncontrolling interests (295) (235) (913) (1,067)
NET INCOME ATTRIBUTABLE TO PAGP $ 16 $ 1 $ 45 $ 3