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Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Segment information for our reportable segments |  |  |  |  |
Operating revenues | $ 36,137 | $ 34,726 | $ 103,645 | $ 104,555 |
Operating income (loss) | 532 | 1,309 | 2,401 | 2,426 |
Total assets by reportable segment |  |  |  |  |
Reportable segment assets | 46,293 |  | 46,293 |  | 44,477
Refining [Member] |  |  |  |  |
Total assets by reportable segment |  |  |  |  |
Reportable segment assets | 43,035 |  | 43,035 |  | 39,490
Retail [Member] |  |  |  |  |
Total assets by reportable segment |  |  |  |  |
Reportable segment assets | 0 |  | 0 |  | 2,043
Ethanol [Member] |  |  |  |  |
Total assets by reportable segment |  |  |  |  |
Reportable segment assets | 879 |  | 879 |  | 929
Corporate and Other [Member] |  |  |  |  |
Total assets by reportable segment |  |  |  |  |
Reportable segment assets | 2,379 |  | 2,379 |  | 2,015
Operating Segments [Member] | Refining [Member] |  |  |  |  |
Segment information for our reportable segments |  |  |  |  |
Operating revenues | 34,747 | 30,543 | 95,864 | 92,181 |
Operating income (loss) | 600 | 1,528 | 2,733 | 2,773 |
Operating Segments [Member] | Retail [Member] |  |  |  |  |
Segment information for our reportable segments |  |  |  |  |
Operating revenues | 0 | 3,092 | 3,896 | 9,089 |
Operating income (loss) | 0 | 41 | 81 | 253 |
Operating Segments [Member] | Ethanol [Member] |  |  |  |  |
Segment information for our reportable segments |  |  |  |  |
Operating revenues | 1,390 | 1,091 | 3,885 | 3,285 |
Operating income (loss) | 113 | (73) | 222 | (59) |
Corporate, Non-Segment [Member] | Corporate and Other [Member] |  |  |  |  |
Segment information for our reportable segments |  |  |  |  |
Operating revenues | 0 | 0 | 0 | 0 |
Operating income (loss) | (181) | (187) | (635) | (541) |
Intersegment Eliminations [Member] |  |  |  |  |
Segment information for our reportable segments |  |  |  |  |
Operating revenues | 16 | 2,363 | 2,962 | 6,881 |
Intersegment Eliminations [Member] | Refining [Member] |  |  |  |  |
Segment information for our reportable segments |  |  |  |  |
Operating revenues | 0 | 2,348 | 2,876 | 6,806 |
Intersegment Eliminations [Member] | Retail [Member] |  |  |  |  |
Segment information for our reportable segments |  |  |  |  |
Operating revenues | 0 | 0 | 0 | 0 |
Intersegment Eliminations [Member] | Ethanol [Member] |  |  |  |  |
Segment information for our reportable segments |  |  |  |  |
Operating revenues | $ 16 | $ 15 | $ 86 | $ 75 |

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