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Revenues and Accounts Receivable - Segment Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 8,253 | $ 8,080 | $ 16,628 | $ 16,478
Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 188 | 152 | 385 | 298
Facilities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 151 | 147 | 307 | 288
Supply and Logistics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 7,914 | 7,781 | 15,936 | 15,892
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 8,698 | 8,872 | 17,368 | 17,778
Total revenues | 8,765 | 8,540 | 17,642 | 17,398
Operating Segments | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 551 | 470 | 1,095 | 920
Total revenues | 559 | 475 | 1,115 | 929
Operating Segments | Facilities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 283 | 278 | 563 | 560
Total revenues | 291 | 284 | 589 | 576
Operating Segments | Supply and Logistics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 7,864 | 8,124 | 15,710 | 16,298
Total revenues | 7,915 | 7,781 | 15,938 | 15,893
Intersegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (512) | (460) | (1,014) | (920)
Intersegment | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (243) | (211) | (497) | (412)
Intersegment | Facilities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (140) | (137) | (282) | (288)
Intersegment | Supply and Logistics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (1) |  | (2) | (1)
Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 67 | (332) | 274 | (380)
Other | Operating Segments | Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 8 | 5 | 20 | 9
Other | Operating Segments | Facilities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 8 | 6 | 26 | 16
Other | Operating Segments | Supply and Logistics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 51 | $ (343) | $ 228 | $ (405)

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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