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Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Segment information for our reportable segments |  |  |  |  |
Operating revenues | $ 34,034 | $ 34,662 | $ 67,508 | $ 69,829 |
Operating income (loss) | 808 | 1,361 | 1,869 | 1,117 |
Total assets by reportable segment |  |  |  |  |
Reportable segment assets | 44,177 |  | 44,177 |  | 44,477
Refining [Member] |  |  |  |  |
Total assets by reportable segment |  |  |  |  |
Reportable segment assets | 40,527 |  | 40,527 |  | 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 | 867 |  | 867 |  | 929
Corporate and Other [Member] |  |  |  |  |
Total assets by reportable segment |  |  |  |  |
Reportable segment assets | 2,783 |  | 2,783 |  | 2,015
Operating Segments [Member] | Refining [Member] |  |  |  |  |
Segment information for our reportable segments |  |  |  |  |
Operating revenues | 31,564 | 30,488 | 61,117 | 61,638 |
Operating income (loss) | 921 | 1,364 | 2,133 | 1,245 |
Operating Segments [Member] | Retail [Member] |  |  |  |  |
Segment information for our reportable segments |  |  |  |  |
Operating revenues | 979 | 3,062 | 3,896 | 5,997 |
Operating income (loss) | 39 | 172 | 81 | 212 |
Operating Segments [Member] | Ethanol [Member] |  |  |  |  |
Segment information for our reportable segments |  |  |  |  |
Operating revenues | 1,491 | 1,112 | 2,495 | 2,194 |
Operating income (loss) | 95 | 5 | 109 | 14 |
Corporate, Non-Segment [Member] | Corporate and Other [Member] |  |  |  |  |
Segment information for our reportable segments |  |  |  |  |
Operating revenues | 0 | 0 | 0 | 0 |
Operating income (loss) | (247) | (180) | (454) | (354) |
Intersegment Eliminations [Member] |  |  |  |  |
Segment information for our reportable segments |  |  |  |  |
Operating revenues | 686 | 2,249 | 2,946 | 4,518 |
Intersegment Eliminations [Member] | Refining [Member] |  |  |  |  |
Segment information for our reportable segments |  |  |  |  |
Operating revenues | 671 | 2,203 | 2,876 | 4,458 |
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 | $ 15 | $ 46 | $ 70 | $ 60 |

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