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Commitments and Contingencies - Clean Air Act Matter, Renewable Fuel Standards, and Environmental Remediation (Details) - EHS $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($) count	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Environmental accruals	$ 11	$ 11	$ 6
Petroleum Segment
Loss Contingencies [Line Items]
Expense for compliance with RFS		190	43	$ 60
RFS obligation	$ 214	$ 214	$ 7
CRRM | Clean Air Act Matter
Loss Contingencies [Line Items]
Number of counts asserted related to alleged violations | count	9

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