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Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Segment information for our reportable segments |  |  |  |  |
Operating revenues from external customers | $ 34,726 | $ 33,713 | $ 104,555 | $ 91,314 |
Intersegment revenues | 2,363 | 2,283 | 6,881 | 6,691 |
Operating income (loss) | 1,309 | 1,979 | 2,426 | 3,513 |
Total assets by reportable segment |  |  |  |  |
Reportable segment assets | 43,792 |  | 43,792 |  | 42,783
Refining [Member] |  |  |  |  |
Segment information for our reportable segments |  |  |  |  |
Operating revenues from external customers | 30,543 | 29,177 | 92,181 | 78,660 |
Intersegment revenues | 2,348 | 2,258 | 6,806 | 6,566 |
Operating income (loss) | 1,528 | 1,947 | 2,773 | 3,476 |
Total assets by reportable segment |  |  |  |  |
Reportable segment assets | 38,198 |  | 38,198 |  | 38,164
Retail [Member] |  |  |  |  |
Segment information for our reportable segments |  |  |  |  |
Operating revenues from external customers | 3,092 | 3,053 | 9,089 | 8,865 |
Intersegment revenues | 0 | 0 | 0 | 0 |
Operating income (loss) | 41 | 97 | 253 | 298 |
Total assets by reportable segment |  |  |  |  |
Reportable segment assets | 2,098 |  | 2,098 |  | 1,999
Ethanol [Member] |  |  |  |  |
Segment information for our reportable segments |  |  |  |  |
Operating revenues from external customers | 1,091 | 1,483 | 3,285 | 3,789 |
Intersegment revenues | 15 | 25 | 75 | 125 |
Operating income (loss) | (73) | 107 | (59) | 215 |
Total assets by reportable segment |  |  |  |  |
Reportable segment assets | 900 |  | 900 |  | 943
Corporate [Member] |  |  |  |  |
Segment information for our reportable segments |  |  |  |  |
Operating revenues from external customers | 0 | 0 | 0 | 0 |
Intersegment revenues | 0 | 0 | 0 | 0 |
Operating income (loss) | (187) | (172) | (541) | (476) |
Total assets by reportable segment |  |  |  |  |
Reportable segment assets | $ 2,596 |  | $ 2,596 |  | $ 1,677

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