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Revenues and Accounts Receivable - Disaggregation of Revenue (Details) - Operating Segments - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | $ 25,455 | $ 35,371 | $ 35,812
Supply and Logistics |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 22,351 | 31,966 | 32,700
Supply and Logistics | Crude oil transactions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 21,202 | 30,082 | 29,592
Supply and Logistics | NGL and other transactions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,149 | 1,884 | 3,108
Transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 2,005 | 2,283 | 1,976
Transportation | Total tariff activities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,906 | 2,138 | 1,827
Transportation | Crude oil pipelines |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,805 | 2,039 | 1,724
Transportation | NGL pipelines |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 101 | 99 | 103
Transportation | Trucking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 99 | 145 | 149
Facilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,099 | 1,122 | 1,136
Facilities | Crude oil, NGL and other terminalling and storage |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 704 | 697 | 688
Facilities | NGL and natural gas processing and fractionation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 350 | 349 | 364
Facilities | Rail load / unload |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | $ 45 | $ 76 | $ 84

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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 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: 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=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: 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=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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