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Revenues and Accounts Receivable - Segment Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 3,225 | $ 8,253 | $ 11,494 | $ 16,628
Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 151 | 188 | 338 | 385
Facilities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 149 | 151 | 323 | 307
Supply and Logistics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,925 | 7,914 | 10,833 | 15,936
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3,772 | 8,698 | 12,401 | 17,368
Total revenues | 3,658 | 8,765 | 12,459 | 17,642
Operating Segments | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 453 | 551 | 1,026 | 1,095
Total revenues | 457 | 559 | 1,036 | 1,115
Operating Segments | Facilities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 264 | 283 | 569 | 563
Total revenues | 276 | 291 | 589 | 589
Operating Segments | Supply and Logistics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3,055 | 7,864 | 10,806 | 15,710
Total revenues | 2,925 | 7,915 | 10,834 | 15,938
Intersegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (433) | (512) | (965) | (1,014)
Intersegment | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (223) | (243) | (504) | (497)
Intersegment | Facilities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (127) | (140) | (266) | (282)
Intersegment | Supply and Logistics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | (1) | (1) | (2)
Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (114) | 67 | 58 | 274
Other | Operating Segments | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 4 | 8 | 10 | 20
Other | Operating Segments | Facilities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 12 | 8 | 20 | 26
Other | Operating Segments | Supply and Logistics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ (130) | $ 51 | $ 28 | $ 228

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