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Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011
Segment information for our three reportable segments |  |  |
Operating revenues from external customers | $ 35,167 | $ 26,308 |
Intersegment revenues | 2,269 | 2,045 |
Operating income (loss) | (244) | 244 |
Total assets by reportable segment |  |  |
Reportable segment assets | 42,634 |  | 42,783
Refining [Member] |  |  |
Segment information for our three reportable segments |  |  |
Operating revenues from external customers | 31,150 | 22,562 |
Intersegment revenues | 2,255 | 1,997 |
Operating income (loss) | (119) | 276 |
Total assets by reportable segment |  |  |
Reportable segment assets | 37,600 |  | 38,164
Retail [Member] |  |  |
Segment information for our three reportable segments |  |  |
Operating revenues from external customers | 2,935 | 2,684 |
Intersegment revenues | 0 | 0 |
Operating income (loss) | 40 | 66 |
Total assets by reportable segment |  |  |
Reportable segment assets | 2,049 |  | 1,999
Ethanol [Member] |  |  |
Segment information for our three reportable segments |  |  |
Operating revenues from external customers | 1,082 | 1,062 |
Intersegment revenues | 14 | 48 |
Operating income (loss) | 9 | 44 |
Total assets by reportable segment |  |  |
Reportable segment assets | 982 |  | 943
Corporate [Member] |  |  |
Segment information for our three reportable segments |  |  |
Operating revenues from external customers | 0 | 0 |
Intersegment revenues | 0 | 0 |
Operating income (loss) | (174) | (142) |
Total assets by reportable segment |  |  |
Reportable segment assets | $ 2,003 |  | $ 1,677

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