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Operating Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 segment | Sep. 30, 2011
Operating Segments |  |  |  |
Operating segments number |  |  | 3 |
Revenues: |  |  |  |
External Customers | $ 9,354 | $ 8,837 | $ 28,358 | $ 25,390
Intersegment | 321 | 199 | 838 | 557
Total revenues of reportable segments | 9,675 | 9,036 | 29,196 | 25,947
Equity earnings in unconsolidated entities | 9 | 4 | 25 | 9
Segment profit | 466 | 426 | 1,404 | 1,139
Maintenance capital | 47 | 25 | 123 | 77
Transportation |  |  |  |
Revenues: |  |  |  |
External Customers | 150 | 140 | 458 | 428
Intersegment | 214 | 160 | 585 | 436
Total revenues of reportable segments | 364 | 300 | 1,043 | 864
Equity earnings in unconsolidated entities | 9 | 4 | 25 | 9
Segment profit | 184 | 152 | 516 | 416
Maintenance capital | 26 | 17 | 78 | 52
Facilities |  |  |  |
Revenues: |  |  |  |
External Customers | 156 | 153 | 533 | 396
Intersegment | 106 | 38 | 252 | 120
Total revenues of reportable segments | 262 | 191 | 785 | 516
Segment profit | 140 | 95 | 344 | 259
Maintenance capital | 17 | 6 | 34 | 16
Supply and Logistics |  |  |  |
Revenues: |  |  |  |
External Customers | 9,048 | 8,544 | 27,367 | 24,566
Intersegment | 1 | 1 | 1 | 1
Total revenues of reportable segments | 9,049 | 8,545 | 27,368 | 24,567
Segment profit | 142 | 179 | 544 | 464
Maintenance capital | 4 | 2 | 11 | 9
Interest expense related to hedged inventory purchases | $ 3 | $ 6 | $ 9 | $ 17

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