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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Total revenues $ 5,952 $ 5,170 $ 4,950 $ 4,111 $ 4,996 $ 5,551 $ 6,663 $ 5,942 $ 20,182 $ 23,152 $ 43,464
Gross margin 286 419 219 349 405 395 290 450 1,273 1,540  
Operating income 218 349 146 282 344 335 211 372 994 1,262 1,799
Net income 127 298 102 203 248 250 124 284 730 906 1,386
Net income attributable to PAA $ 126 $ 297 $ 101 $ 202 $ 247 $ 249 $ 124 $ 283 $ 726 $ 903 $ 1,384
Basic net income/(loss) per common unit (in dollars per unit) $ 0.14 $ 0.40 $ (0.20) $ 0.07 $ 0.24 $ 0.25 $ (0.06) $ 0.36 $ 0.43 $ 0.78  
Diluted net income/(loss) per common unit (in dollars per unit) 0.14 0.40 (0.20) 0.07 0.24 0.24 (0.06) 0.35 0.43 0.77  
Cash distributions per common unit (in dollars per unit) $ 0.55 $ 0.7 $ 0.7 $ 0.7 $ 0.7 $ 0.70 $ 0.69 $ 0.68 $ 2.65 $ 2.76