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Quarterly Financial Data (Unaudited) (Details) (USD $)
In Millions, except Per Share data, 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, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Financial Data (Unaudited)                              
Revenues $ 9,439 $ 9,354 $ 9,786 $ 9,218 $ 8,884 $ 8,837 $ 8,859 $ 7,694         $ 37,797 $ 34,275 $ 25,893
Gross margin 480 328 551 407 453 413 371 355         1,767 1,592  
Operating income 402 247 462 313 359 357 298 285         1,425 1,298 767
Net income 330 173 386 237 288 288 233 185         1,127 994 514
Net income attributable to Plains $ 320 $ 165 $ 378 $ 230 $ 278 $ 281 $ 225 $ 182         $ 1,094 $ 966 $ 505
Basic net income per limited partner unit (in dollars per unit) $ 0.70 $ 0.27 $ 0.93 $ 0.52 $ 0.69 $ 0.74 $ 0.57 $ 0.45         $ 2.41 $ 2.46 $ 1.21
Diluted net income per limited partner unit (in dollars per unit) $ 0.69 $ 0.27 $ 0.93 $ 0.51 $ 0.68 $ 0.74 $ 0.57 $ 0.45         $ 2.40 $ 2.44 $ 1.20
Cash distributions per common unit (in dollars per unit) $ 0.5425 $ 0.5325 $ 0.5225 $ 0.5125 $ 0.4975 $ 0.4913 $ 0.4850 $ 0.4788 $ 0.4750 $ 0.4713 $ 0.4675 $ 0.4638 $ 2.1100 $ 1.9525 $ 1.88