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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Data (Unaudited)                              
Total revenues $ 4,996 $ 5,551 $ 6,663 $ 5,942 $ 9,459 $ 11,127 $ 11,195 $ 11,684         $ 23,152 $ 43,464 $ 42,249
Gross margin 405 395 290 450 599 484 457 584         1,540 2,124  
Operating income 344 335 211 372 532 406 367 495         1,262 1,799 1,738
Net income 248 250 124 284 390 324 288 385         906 1,386 1,391
Net income attributable to PAA $ 247 $ 249 $ 124 $ 283 $ 389 $ 323 $ 287 $ 384         $ 903 $ 1,384 $ 1,361
Basic net income/(loss) per common unit (in dollars per unit) $ 0.24 $ 0.25 $ (0.06) $ 0.36 $ 0.67 $ 0.52 $ 0.45 $ 0.74         $ 0.78 $ 2.39 $ 2.82
Diluted net income/(loss) per common unit (in dollars per unit) 0.24 0.24 (0.06) 0.35 0.67 0.52 0.45 0.73         0.77 2.38 $ 2.80
Cash distributions per common unit (in dollars per unit) $ 0.7000 $ 0.6950 $ 0.6850 $ 0.6750 $ 0.6600 $ 0.6450 $ 0.6300 $ 0.6150 $ 0.6000 $ 0.5875 $ 0.5750 $ 0.5625 $ 2.7550 $ 2.5500