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Operating Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 segment | Mar. 31, 2011
Operating Segments |  |
Number of Operating Segments | 3 |
Revenues: |  |
External Customers | $ 9,218 | $ 7,694
Intersegment | 212 | 177
Total revenues of reportable segments | 9,430 | 7,871
Equity earnings in unconsolidated entities | 7 |
Segment profit | 380 | 348
Maintenance capital | 35 | 24
Transportation |  |
Revenues: |  |
External Customers | 150 | 141
Intersegment | 167 | 134
Total revenues of reportable segments | 317 | 275
Equity earnings in unconsolidated entities | 7 |
Segment profit | 162 | 137
Maintenance capital | 24 | 18
Facilities |  |
Revenues: |  |
External Customers | 191 | 118
Intersegment | 45 | 43
Total revenues of reportable segments | 236 | 161
Segment profit | 90 | 78
Maintenance capital | 7 | 3
Supply and Logistics |  |
Revenues: |  |
External Customers | 8,877 | 7,435
Total revenues of reportable segments | 8,877 | 7,435
Segment profit | 128 | 133
Maintenance capital | 4 | 3
Interest expense related to hedged inventory purchases | $ 2 | $ 5

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- Definition The interest expense incurred related to hedged inventory purchases made during the period, which is included in segment profit. + References No definition available. + Details
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- Definition Capital expenditures made during the period for the replacement of partially or fully depreciated assets in order to maintain the service capability, level of production, and/or functionality of the company's existing assets. + References No definition available. + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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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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- Definition Amount of revenue from transactions with other operating segments of the same entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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