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Operating Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 segment | Jun. 30, 2011
Operating Segments |  |  |  |
Operating segments number |  |  | 3 |
Revenues: |  |  |  |
External Customers | $ 9,786 | $ 8,859 | $ 19,004 | $ 16,553
Intersegment | 304 | 181 | 516 | 358
Total revenues of reportable segments | 10,090 | 9,040 | 19,520 | 16,911
Equity earnings in unconsolidated entities | 9 | 4 | 16 | 5
Segment profit | 557 | 365 | 938 | 714
Maintenance capital | 40 | 27 | 76 | 52
Transportation |  |  |  |
Revenues: |  |  |  |
External Customers | 158 | 147 | 307 | 288
Intersegment | 203 | 143 | 371 | 276
Total revenues of reportable segments | 361 | 290 | 678 | 564
Equity earnings in unconsolidated entities | 9 | 4 | 16 | 5
Segment profit | 169 | 128 | 332 | 265
Maintenance capital | 27 | 17 | 52 | 35
Facilities |  |  |  |
Revenues: |  |  |  |
External Customers | 186 | 126 | 378 | 244
Intersegment | 101 | 38 | 145 | 81
Total revenues of reportable segments | 287 | 164 | 523 | 325
Segment profit | 114 | 86 | 204 | 164
Maintenance capital | 10 | 7 | 17 | 10
Supply and Logistics |  |  |  |
Revenues: |  |  |  |
External Customers | 9,442 | 8,586 | 18,319 | 16,021
Intersegment |  |  |  | 1
Total revenues of reportable segments | 9,442 | 8,586 | 18,319 | 16,022
Segment profit | 274 | 151 | 402 | 285
Maintenance capital | 3 | 3 | 7 | 7
Interest expense related to hedged inventory purchases | $ 4 | $ 7 | $ 6 | $ 12

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