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Segment Reporting Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Energy Segment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Disaggregated revenue | $ 3,930 | $ 6,364 | $ 7,124
Automotive Segment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Disaggregated revenue | 2,478 | 2,884 | 2,858
Petroleum products | Energy Segment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Disaggregated revenue | 3,580 | 5,960 | 6,773
Nitrogen fertilizer products | Energy Segment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Disaggregated revenue | 350 | 404 | 351
Automotive services | Automotive Segment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Disaggregated revenue | 1,228 | 1,373 | 1,321
Automotive parts [Member] | Automotive Segment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Disaggregated revenue | $ 1,250 | $ 1,511 | $ 1,537

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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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