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Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Segment information for our reportable segments |  |  |
Operating revenues from external customers | $ 33,474 | $ 35,167 |
Intersegment revenues | 2,260 | 2,269 |
Operating income (loss) | 1,061 | (244) |
Total assets by reportable segment |  |  |
Reportable segment assets | 45,501 |  | 44,477
Refining [Member] |  |  |
Segment information for our reportable segments |  |  |
Operating revenues from external customers | 29,553 | 31,150 |
Intersegment revenues | 2,205 | 2,255 |
Operating income (loss) | 1,212 | (119) |
Total assets by reportable segment |  |  |
Reportable segment assets | 40,185 |  | 39,490
Retail [Member] |  |  |
Segment information for our reportable segments |  |  |
Operating revenues from external customers | 2,917 | 2,935 |
Intersegment revenues | 0 | 0 |
Operating income (loss) | 42 | 40 |
Total assets by reportable segment |  |  |
Reportable segment assets | 2,125 |  | 2,043
Ethanol [Member] |  |  |
Segment information for our reportable segments |  |  |
Operating revenues from external customers | 1,004 | 1,082 |
Intersegment revenues | 55 | 14 |
Operating income (loss) | 14 | 9 |
Total assets by reportable segment |  |  |
Reportable segment assets | 924 |  | 929
Corporate [Member] |  |  |
Segment information for our reportable segments |  |  |
Operating revenues from external customers | 0 | 0 |
Intersegment revenues | 0 | 0 |
Operating income (loss) | (207) | (174) |
Total assets by reportable segment |  |  |
Reportable segment assets | $ 2,267 |  | $ 2,015

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