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Operating Segments (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Reconciliation of segment profit to net income attributable to Plains        
Segment profit $ 557 $ 365 $ 938 $ 714
Depreciation and amortization (86) (63) (146) (126)
Interest expense (75) (62) (140) (128)
Other income/(expense), net   2 2 (20)
Income tax expense (10) (9) (30) (22)
NET INCOME 386 233 624 418
Net income attributable to noncontrolling interests (8) (8) (15) (10)
NET INCOME ATTRIBUTABLE TO PLAINS $ 378 $ 225 $ 609 $ 408