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Operating Segments (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of segment profit to net income attributable to Plains                      
Segment profit                 $ 1,945 $ 1,560 $ 1,026
Depreciation and amortization                 (482) (249) (256)
Interest expense                 (288) (253) (248)
Other income/(expense), net                 6 (19) (9)
Income tax benefit/(expense)                 (54) (45) 1
NET INCOME 330 173 386 237 288 288 233 185 1,127 994 514
Net income attributable to noncontrolling interests                 (33) (28) (9)
NET INCOME ATTRIBUTABLE TO PLAINS $ 320 $ 165 $ 378 $ 230 $ 278 $ 281 $ 225 $ 182 $ 1,094 $ 966 $ 505