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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Total revenues | $ 7,605 | $ 5,873 | $ 6,078 | $ 6,667 | $ 5,952 | $ 5,170 | $ 4,950 | $ 4,111 | $ 26,223 | $ 20,182 | $ 23,152
Gross margin | 327 | 112 | 325 | 665 | 286 | 419 | 219 | 349 | 1,429 | 1,273 |
Operating income | 261 | 44 | 257 | 591 | 218 | 349 | 146 | 282 | 1,153 | 994 | 1,262
Net income | 191 | 34 | 189 | 444 | 127 | 298 | 102 | 203 | 858 | 730 | 906
Net income attributable to PAA | $ 191 | $ 33 | $ 188 | $ 444 | $ 126 | $ 297 | $ 101 | $ 202 | $ 856 | $ 726 | $ 903
Cash distributions per common unit (in dollars per unit) | $ 0.30 | $ 0.55 | $ 0.55 | $ 0.55 | $ 0.55 | $ 0.70 | $ 0.70 | $ 0.70 | $ 1.95 | $ 2.65 |
Common Units |  |  |  |  |  |  |  |  |  |  |
Basic net income/(loss) per common unit (in dollars per unit) | 0.19 | (0.01) | 0.21 | 0.59 | 0.14 | 0.40 | (0.20) | 0.07 | 0.96 | 0.43 | $ 0.78
Diluted net income/(loss) per common unit (in dollars per unit) | $ 0.19 | $ (0.01) | $ 0.21 | $ 0.58 | $ 0.14 | $ 0.40 | $ (0.20) | $ 0.07 | $ 0.95 | $ 0.43 | $ 0.77

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