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Segment Reporting - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Energy Segment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 675	$ 1,687	$ 1,806	$ 3,173
Automotive Segment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	587	744	1,222	1,437
Petroleum products | Energy Segment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	570	1,549	1,626	2,943
Nitrogen fertilizer products | Energy Segment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	105	138	180	230
Automotive services | Automotive Segment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	277	345	586	671
Aftermarket parts sales | Automotive Segment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 310	$ 399	$ 636	$ 766

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+ References

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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

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