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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Total revenues | $ 8,786 | $ 8,792 | $ 8,080 | $ 8,398 | $ 7,605 | $ 5,873 | $ 6,078 | $ 6,667 | $ 34,055 | $ 26,223 | $ 20,182
Gross margin | 1,399 | 567 | 168 | 460 | 327 | 112 | 325 | 665 | 2,593 | 1,429 |
Operating income | 1,315 | 493 | 88 | 381 | 261 | 44 | 257 | 591 | 2,277 | 1,153 | 994
Net income | 1,117 | 710 | 100 | 288 | 191 | 34 | 189 | 444 | 2,216 | 858 | 730
Net income attributable to PAA | $ 1,117 | $ 710 | $ 100 | $ 288 | $ 191 | $ 33 | $ 188 | $ 444 | $ 2,216 | $ 856 | $ 726
Cash distributions per common unit (in dollars per unit) | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.55 | $ 0.55 | $ 0.55 | $ 1.20 | $ 1.95 |
Common Units |  |  |  |  |  |  |  |  |  |  |
Basic net income/(loss) per common unit (in dollars per unit) | 1.46 | 0.91 | 0.07 | 0.33 | 0.19 | (0.01) | 0.21 | 0.59 | 2.77 | 0.96 | $ 0.43
Diluted net income/(loss) per common unit (in dollars per unit) | $ 1.38 | $ 0.87 | $ 0.07 | $ 0.33 | $ 0.19 | $ (0.01) | $ 0.21 | $ 0.58 | $ 2.71 | $ 0.95 | $ 0.43

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