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v3.20.4

Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Total revenues | $ 5,963 | $ 5,833 | $ 3,225 | $ 8,269 | $ 9,154 | $ 7,886 | $ 8,253 | $ 8,375 | $ 23,290 | $ 33,669 | $ 34,055
Gross margin | 5 | 314 | 282 | (189) | 403 | 566 | 526 | 790 | 411 | 2,285 |
Operating income/(loss) | (65) | 253 | 210 | (2,773) | 331 | 492 | 451 | 714 | (2,375) | 1,988 | 2,277
Net income/(loss) | (25) | 146 | 144 | (2,845) | 307 | 454 | 448 | 970 | (2,580) | 2,180 | 2,216
Net income/(loss) attributable to PAA | (28) | 143 | 142 | (2,847) | $ 306 | $ 449 | $ 446 | $ 970 | (2,590) | 2,171 | 2,216
Goodwill impairment losses |  |  |  | 2,515 |  |  |  |  | 2,515 | 0 | $ 0
Non-cash impairment losses upon classification to assets held for sale |  |  |  | 167 |  |  |  |  |  |  |
Gain on/(impairment of) investments in unconsolidated entities, net |  |  |  |  |  |  |  |  |  |  |
Write down of investments |  | 91 | $ 69 | 43 |  |  |  |  |  |  |
Gain on/(impairment of) investments in unconsolidated entities, net | Capline Pipeline Company LLC |  |  |  |  |  |  |  |  |  |  |
Gain from remeasurement to fair value of retained investment |  | $ 2 |  | 267 |  |  |  |  |  | $ 269 |
(Gains)/losses on asset sales and asset impairments, net |  |  |  |  |  |  |  |  |  |  |
Non-cash impairment losses, long-lived assets | $ 95 |  |  | $ 446 |  |  |  |  | $ 541 |  |
Common Units |  |  |  |  |  |  |  |  |  |  |
Basic net income/(loss) per common unit (in dollars per unit) | $ (0.11) | $ 0.13 | $ 0.13 | $ (3.98) | $ 0.35 | $ 0.55 | $ 0.54 | $ 1.26 | $ (3.83) | $ 2.70 | $ 2.77
Diluted net income/(loss) per common unit (in dollars per unit) | (0.11) | 0.13 | 0.13 | (3.98) | 0.35 | 0.55 | 0.54 | 1.20 | (3.83) | 2.65 | $ 2.71
Cash distributions per common unit (in dollars per unit) | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.36 | $ 0.36 | $ 0.36 | $ 0.36 | $ 0.30 | $ 0.90 | $ 1.38 |

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