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Quarterly Financial Data (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 9,439 | $ 9,354 | $ 9,786 | $ 9,218 | $ 8,884 | $ 8,837 | $ 8,859 | $ 7,694 |  |  |  |  | $ 37,797 | $ 34,275 | $ 25,893
Gross margin | 480 | 328 | 551 | 407 | 453 | 413 | 371 | 355 |  |  |  |  | 1,767 | 1,592 |
Operating income | 402 | 247 | 462 | 313 | 359 | 357 | 298 | 285 |  |  |  |  | 1,425 | 1,298 | 767
Net income | 330 | 173 | 386 | 237 | 288 | 288 | 233 | 185 |  |  |  |  | 1,127 | 994 | 514
Net income attributable to Plains | $ 320 | $ 165 | $ 378 | $ 230 | $ 278 | $ 281 | $ 225 | $ 182 |  |  |  |  | $ 1,094 | $ 966 | $ 505
Basic net income per limited partner unit (in dollars per unit) | $ 0.70 | $ 0.27 | $ 0.93 | $ 0.52 | $ 0.69 | $ 0.74 | $ 0.57 | $ 0.45 |  |  |  |  | $ 2.41 | $ 2.46 | $ 1.21
Diluted net income per limited partner unit (in dollars per unit) | $ 0.69 | $ 0.27 | $ 0.93 | $ 0.51 | $ 0.68 | $ 0.74 | $ 0.57 | $ 0.45 |  |  |  |  | $ 2.40 | $ 2.44 | $ 1.20
Cash distributions per common unit (in dollars per unit) | $ 0.5425 | $ 0.5325 | $ 0.5225 | $ 0.5125 | $ 0.4975 | $ 0.4913 | $ 0.4850 | $ 0.4788 | $ 0.4750 | $ 0.4713 | $ 0.4675 | $ 0.4638 | $ 2.1100 | $ 1.9525 | $ 1.88

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