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Operating Segments - Segment Financial Data (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 USD ($) segment | Mar. 31, 2015 USD ($)
Operating Segments |  |
Operating segments number | segment | 3 |
Revenues: |  |
Total revenues | $ 4,111 | $ 5,942
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments |  |
Equity earnings in unconsolidated entities | 47 | 37
Segment profit | 443 | 513
Maintenance capital | 47 | 50
Transportation |  |
Revenues: |  |
Total revenues | 154 | 185
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments |  |
Equity earnings in unconsolidated entities | 47 | 37
Segment profit | 247 | 241
Maintenance capital | 35 | 33
Facilities |  |
Revenues: |  |
Total revenues | 138 | 125
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments |  |
Segment profit | 159 | 142
Maintenance capital | 9 | 15
Supply and Logistics |  |
Revenues: |  |
Total revenues | 3,819 | 5,632
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments |  |
Segment profit | 37 | 130
Interest expense related to hedged inventory purchases | 2 | 1
Maintenance capital | 3 | 2
Operating Segments |  |
Revenues: |  |
Total revenues | 4,469 | 6,291
Operating Segments | Transportation |  |
Revenues: |  |
Total revenues | 383 | 400
Operating Segments | Facilities |  |
Revenues: |  |
Total revenues | 265 | 257
Operating Segments | Supply and Logistics |  |
Revenues: |  |
Total revenues | 3,821 | 5,634
Intersegment |  |
Revenues: |  |
Total revenues | (358) | (349)
Intersegment | Transportation |  |
Revenues: |  |
Total revenues | (229) | (215)
Intersegment | Facilities |  |
Revenues: |  |
Total revenues | (127) | (132)
Intersegment | Supply and Logistics |  |
Revenues: |  |
Total revenues | $ (2) | $ (2)

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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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