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Operating Segments (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Reconciliation of segment profit to net income attributable to Plains                      
Segment profit                 $ 1,560 $ 1,026 $ 1,030
Depreciation and amortization                 (249) (256) (236)
Interest expense                 (253) (248) (224)
Other income/(expense), net                 (19) (9) 16
Income tax benefit/(expense)                 (45) 1 (6)
NET INCOME 288 288 233 185 146 84 133 151 994 514 580
Less: Net income attributable to noncontrolling interests                 (28) (9) (1)
NET INCOME ATTRIBUTABLE TO PLAINS $ 278 $ 281 $ 225 $ 182 $ 142 $ 81 $ 131 $ 151 $ 966 $ 505 $ 579