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Segment Reporting - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Energy Segment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,783	$ 675	$ 3,246	$ 1,806
Automotive Segment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	637	587	1,235	1,222
Petroleum products | Energy Segment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,645	570	3,047	1,626
Nitrogen fertilizer products | Energy Segment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	138	105	199	180
Automotive services | Automotive Segment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	347	277	669	586
Aftermarket parts sales | Automotive Segment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 290	$ 310	$ 566	$ 636

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