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Operating Segments (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Reconciliation of segment profit to net income attributable to Plains        
Segment profit $ 485 $ 557 $ 1,233 $ 938
Depreciation and amortization (91) (86) (173) (146)
Interest expense (75) (75) (152) (140)
Other income/(expense), net (1)   (1) 2
Income tax expense (18) (10) (70) (30)
NET INCOME 300 386 837 624
Net income attributable to noncontrolling interests (8) (8) (16) (15)
NET INCOME ATTRIBUTABLE TO PLAINS $ 292 $ 378 $ 821 $ 609