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Operating Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 segment | Mar. 31, 2012
Operating Segments |  |
Operating segments number | 3 |
Revenues: |  |
External Customers | $ 10,620 | $ 9,218
Intersegment | 327 | 212
Total revenues of reportable segments | 10,947 | 9,430
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments |  |
Equity earnings in unconsolidated entities | 11 | 7
Segment profit | 748 | 380
Maintenance capital | 44 | 35
Transportation |  |
Revenues: |  |
External Customers | 173 | 150
Intersegment | 195 | 167
Total revenues of reportable segments | 368 | 317
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments |  |
Equity earnings in unconsolidated entities | 11 | 7
Segment profit | 164 | 162
Maintenance capital | 32 | 24
Facilities |  |
Revenues: |  |
External Customers | 223 | 191
Intersegment | 131 | 45
Total revenues of reportable segments | 354 | 236
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments |  |
Segment profit | 150 | 90
Maintenance capital | 7 | 7
Supply and Logistics |  |
Revenues: |  |
External Customers | 10,224 | 8,877
Intersegment | 1 |
Total revenues of reportable segments | 10,225 | 8,877
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments |  |
Segment profit | 434 | 128
Maintenance capital | 5 | 4
Interest expense related to hedged inventory | $ 5 | $ 2

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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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