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Operating Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 segment | Dec. 31, 2011 | Dec. 31, 2010
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Operating segments number |  |  |  |  |  |  |  |  | 3 |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
External Customers | $ 9,439 | $ 9,354 | $ 9,786 | $ 9,218 | $ 8,884 | $ 8,837 | $ 8,859 | $ 7,694 | $ 37,797 | $ 34,275 | $ 25,893
Intersegment |  |  |  |  |  |  |  |  | 1,157 | 754 | 632
Total revenues of reportable segments |  |  |  |  |  |  |  |  | 38,954 | 35,029 | 26,525
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments |  |  |  |  |  |  |  |  |  |  |
Equity earnings in unconsolidated entities |  |  |  |  |  |  |  |  | 38 | 13 | 3
Segment profit |  |  |  |  |  |  |  |  | 1,945 | 1,560 | 1,026
Capital expenditures |  |  |  |  |  |  |  |  | 3,471 | 1,935 | 762
Total assets | 19,235 |  |  |  | 15,381 |  |  |  | 19,235 | 15,381 | 13,703
Maintenance capital |  |  |  |  |  |  |  |  | 170 | 120 | 93
Transportation |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
External Customers |  |  |  |  |  |  |  |  | 623 | 572 | 565
Intersegment |  |  |  |  |  |  |  |  | 793 | 593 | 480
Total revenues of reportable segments |  |  |  |  |  |  |  |  | 1,416 | 1,165 | 1,045
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments |  |  |  |  |  |  |  |  |  |  |
Equity earnings in unconsolidated entities |  |  |  |  |  |  |  |  | 38 | 13 | 3
Segment profit |  |  |  |  |  |  |  |  | 710 | 555 | 516
Capital expenditures |  |  |  |  |  |  |  |  | 1,244 | 600 | 329
Total assets | 6,423 |  |  |  | 5,156 |  |  |  | 6,423 | 5,156 | 4,701
Maintenance capital |  |  |  |  |  |  |  |  | 108 | 86 | 67
Facilities |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
External Customers |  |  |  |  |  |  |  |  | 736 | 638 | 339
Intersegment |  |  |  |  |  |  |  |  | 362 | 158 | 151
Total revenues of reportable segments |  |  |  |  |  |  |  |  | 1,098 | 796 | 490
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments |  |  |  |  |  |  |  |  |  |  |
Segment profit |  |  |  |  |  |  |  |  | 482 | 358 | 270
Capital expenditures |  |  |  |  |  |  |  |  | 1,724 | 1,317 | 270
Total assets | 6,134 |  |  |  | 4,506 |  |  |  | 6,134 | 4,506 | 3,303
Maintenance capital |  |  |  |  |  |  |  |  | 49 | 22 | 17
Supply and Logistics |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
External Customers |  |  |  |  |  |  |  |  | 36,438 | 33,065 | 24,989
Intersegment |  |  |  |  |  |  |  |  | 2 | 3 | 1
Total revenues of reportable segments |  |  |  |  |  |  |  |  | 36,440 | 33,068 | 24,990
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments |  |  |  |  |  |  |  |  |  |  |
Segment profit |  |  |  |  |  |  |  |  | 753 | 647 | 240
Capital expenditures |  |  |  |  |  |  |  |  | 503 | 18 | 163
Total assets | 6,678 |  |  |  | 5,719 |  |  |  | 6,678 | 5,719 | 5,699
Maintenance capital |  |  |  |  |  |  |  |  | 13 | 12 | 9
Interest expense related to hedged inventory purchases |  |  |  |  |  |  |  |  | $ 12 | $ 20 | $ 17

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