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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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
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, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Data (Unaudited)                              
Revenues $ 10,631 $ 10,703 $ 10,295 $ 10,620 $ 9,439 $ 9,354 $ 9,786 $ 9,218         $ 42,249 $ 37,797 $ 34,275
Gross margin 478 375 474 761 480 328 551 407         2,087 1,767  
Operating income 394 296 383 655 402 247 462 313         1,728 1,425 1,298
Net income 318 237 300 536 330 173 386 237         1,391 1,127 994
Net income attributable to PAA $ 309 $ 231 $ 292 $ 528 $ 320 $ 165 $ 378 $ 230         $ 1,361 $ 1,094 $ 966
Basic net income per limited partner unit (in dollars per unit) $ 0.59 $ 0.38 $ 0.58 $ 1.28 $ 0.70 $ 0.27 $ 0.93 $ 0.52         $ 2.82 $ 2.41 $ 2.46
Diluted net income per limited partner unit (in dollars per unit) $ 0.58 $ 0.38 $ 0.57 $ 1.27 $ 0.69 $ 0.27 $ 0.93 $ 0.51         $ 2.80 $ 2.40 $ 2.44
Cash distributions per common unit (in dollars per unit) $ 0.6000 $ 0.5875 $ 0.5750 $ 0.5625 $ 0.5425 $ 0.5325 $ 0.5225 $ 0.5125 $ 0.4975 $ 0.4913 $ 0.4850 $ 0.4788 $ 2.3250 $ 2.1100 $ 1.95