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Operating Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 segment | Sep. 30, 2012
Operating Segments |  |  |  |
Operating segments number |  |  | 3 |
Revenues: |  |  |  |
External Customers | $ 10,703 | $ 9,354 | $ 31,617 | $ 28,358
Intersegment | 341 | 321 | 1,021 | 838
Total revenues of reportable segments | 11,044 | 9,675 | 32,638 | 29,196
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments |  |  |  |
Equity earnings in unconsolidated entities | 19 | 9 | 42 | 25
Segment profit | 408 | 466 | 1,640 | 1,404
Maintenance capital | 42 | 47 | 124 | 123
Transportation |  |  |  |
Revenues: |  |  |  |
External Customers | 179 | 150 | 517 | 458
Intersegment | 199 | 214 | 594 | 585
Total revenues of reportable segments | 378 | 364 | 1,111 | 1,043
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments |  |  |  |
Equity earnings in unconsolidated entities | 19 | 9 | 42 | 25
Segment profit | 198 | 184 | 522 | 516
Maintenance capital | 29 | 26 | 84 | 78
Facilities |  |  |  |
Revenues: |  |  |  |
External Customers | 138 | 156 | 558 | 533
Intersegment | 142 | 106 | 425 | 252
Total revenues of reportable segments | 280 | 262 | 983 | 785
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments |  |  |  |
Segment profit | 146 | 140 | 445 | 344
Maintenance capital | 6 | 17 | 23 | 34
Supply and Logistics |  |  |  |
Revenues: |  |  |  |
External Customers | 10,386 | 9,048 | 30,542 | 27,367
Intersegment |  | 1 | 2 | 1
Total revenues of reportable segments | 10,386 | 9,049 | 30,544 | 27,368
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments |  |  |  |
Segment profit | 64 | 142 | 673 | 544
Maintenance capital | 7 | 4 | 17 | 11
Interest expense related to hedged inventory | $ 8 | $ 3 | $ 21 | $ 9

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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