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Segment Reporting Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Cost of goods sold | $ 2,406 | $ 2,054 | $ 7,007 | $ 6,174
Net sales | 2,864 | 2,404 | 8,220 | 7,107
Automotive Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Cost of goods sold | 373 | 396 | 1,119 | 1,125
Net sales | 600 | 604 | 1,760 | 1,702
Revenue from contracts with customers | 735 | 700 | 2,158 | 2,031
Energy Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Cost of goods sold | 1,742 | 1,357 | 4,948 | 4,191
Net sales | 1,935 | 1,454 | 5,386 | 4,395
Revenue from contracts with customers | 1,935 | 1,454 | 5,386 | 4,395
Automotive services | Automotive Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 341 | 311 | 992 | 873
Commercial sales | Automotive Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 258 | 246 | 758 | 740
Retail sales | Automotive Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 136 | 143 | 408 | 418
Petroleum products | Energy Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,855 | 1,384 | 5,133 | 4,142
Nitrogen fertilizer products | Energy Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 80 | 70 | 253 | 253
Difference between Revenue Guidance in Effect before and after adoption | Automotive Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Cost of goods sold | 15 | 14 | 47 | 50
Net sales | $ 15 | $ 14 | $ 47 | $ 50

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- Definition Total costs related to goods produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 32 -Paragraph 2A -URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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