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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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Loss Contingencies [Line Items]
Expense (benefit) for compliance with RFS	$ 153	$ 173	$ 259	$ 351
RFS obligation	$ 708		$ 708		$ 494

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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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