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Operating Segments (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Reconciliation of segment profit to net income attributable to Plains    
Segment profit $ 380 $ 348
Depreciation and amortization (60) (63)
Interest expense (65) (65)
Other income/(expense), net 2 (22)
Income tax expense (20) (13)
NET INCOME 237 185
Net income attributable to noncontrolling interests (7) (3)
NET INCOME ATTRIBUTABLE TO PLAINS $ 230 $ 182