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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Total revenues $ 9,154 $ 7,886 $ 8,253 $ 8,375 $ 8,786 $ 8,792 $ 8,080 $ 8,398 $ 33,669 $ 34,055 $ 26,223
Gross margin 403 566 526 790 1,399 567 168 460 2,285 2,593  
Operating income 331 492 451 714 1,315 493 88 381 1,988 2,277 1,153
Net income 307 454 448 970 1,117 710 100 288 2,180 2,216 858
Net income attributable to PAA $ 306 $ 449 $ 446 $ 970 $ 1,117 $ 710 $ 100 $ 288 $ 2,171 $ 2,216 $ 856
Common Units                      
Basic net income/(loss) per common unit (in dollars per unit) $ 0.35 $ 0.55 $ 0.54 $ 1.26 $ 1.46 $ 0.91 $ 0.07 $ 0.33 $ 2.70 $ 2.77 $ 0.96
Diluted net income/(loss) per common unit (in dollars per unit) 0.35 0.55 0.54 1.20 1.38 0.87 0.07 0.33 2.65 2.71 $ 0.95
Cash distributions per common unit (in dollars per unit) $ 0.36 $ 0.36 $ 0.36 $ 0.30 $ 0.30 $ 0.30 $ 0.30 $ 0.30 $ 1.38 $ 1.20