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Commitments and Contingencies - RFS (Details) - Petroleum Segment - Environmental, Health, and Safety Matters - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Loss Contingencies [Line Items]
Expense for compliance with RFS	$ 173	$ 16	$ 351	$ 35
RFS obligation	$ 485		$ 485		$ 214

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- Definition

Expense (Benefit) for Compliance with Renewable Fuel Standard

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- Definition

Renewable Fuel Standards Obligation, Current

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- Definition

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