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Revenues - Segment Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 8,080 | $ 6,078 | $ 16,478 | $ 12,745
Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 152 | 161 | 298 | 299
Facilities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 147 | 136 | 288 | 270
Supply and Logistics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 7,781 | 5,781 | 15,892 | 12,176
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 8,872 |  | 17,778 |
Total revenues | 8,540 | 6,497 | 17,398 | 13,580
Operating Segments | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 470 |  | 920 |
Total revenues | 475 | 425 | 929 | 814
Operating Segments | Facilities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 278 |  | 560 |
Total revenues | 284 | 289 | 576 | 582
Operating Segments | Supply and Logistics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 8,124 |  | 16,298 |
Total revenues | 7,781 | 5,783 | 15,893 | 12,184
Intersegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (460) | (419) | (920) | (835)
Intersegment | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (211) | (167) | (412) | (331)
Intersegment | Facilities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (137) | (153) | (288) | (312)
Intersegment | Supply and Logistics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | $ (2) | (1) | $ (8)
Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (332) |  | (380) |
Other | Operating Segments | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 5 |  | 9 |
Other | Operating Segments | Facilities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 6 |  | 16 |
Other | Operating Segments | Supply and Logistics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ (343) |  | $ (405) |

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