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Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 segments | Dec. 31, 2012 | Dec. 31, 2011
Segment information for our three reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 34,429 | $ 36,137 | $ 34,034 | [1] | $ 33,474 | $ 34,695 | $ 34,726 | $ 34,662 | $ 35,167 | [1],[2] | $ 138,074 | $ 139,250 | $ 125,987
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  | 1,720 | 1,574 | 1,534
Operating income (loss) | 1,562 | 532 | 808 | [1] | 1,061 | 1,584 | 1,309 | 1,361 | (244) | [1],[2] | 3,963 | 4,010 | 3,680
Total expenditures for long-lived assets |  |  |  |  |  |  |  |  |  |  | 2,757 | 3,413 | 2,987
Segment Information (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments |  |  |  |  |  |  |  |  |  |  | 2 |  |
Refining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment information for our three reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 129,064 | 122,925 | 109,138
Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment information for our three reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 3,896 | 12,008 | 11,699
Ethanol [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment information for our three reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 5,114 | 4,317 | 5,150
Corporate, Non-Segment [Member] | Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment information for our three reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  | 68 | 43 | 42
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | (826) | (741) | (613)
Total expenditures for long-lived assets |  |  |  |  |  |  |  |  |  |  | 65 | 66 | 113
Operating Segments [Member] | Refining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment information for our three reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 129,064 | 122,925 | 109,138
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  | 1,566 | 1,370 | 1,338
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | 4,217 | 4,450 | 3,516
Total expenditures for long-lived assets |  |  |  |  |  |  |  |  |  |  | 2,597 | 3,147 | 2,708
Operating Segments [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment information for our three reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 3,896 | 12,008 | 11,699
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  | 41 | 119 | 115
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | 81 | 348 | 381
Total expenditures for long-lived assets |  |  |  |  |  |  |  |  |  |  | 62 | 164 | 134
Operating Segments [Member] | Ethanol [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment information for our three reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 5,114 | 4,317 | 5,150
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  | 45 | 42 | 39
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | 491 | (47) | 396
Total expenditures for long-lived assets |  |  |  |  |  |  |  |  |  |  | 33 | 36 | 32
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment information for our three reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 3,004 | 9,061 | 8,810
Intersegment Eliminations [Member] | Refining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment information for our three reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 2,876 | 8,946 | 8,665
Intersegment Eliminations [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment information for our three reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intersegment Eliminations [Member] | Ethanol [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment information for our three reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | $ 128 | $ 115 | $ 145
[1] | The separation of our retail business was completed on May 1, 2013.
[2] | The operations of the Aruba Refinery were suspended in March 2012.

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