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Commitments and Contingencies - RFS (Details) - Petroleum Segment - Environmental, Health, and Safety Matters - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Loss Contingencies [Line Items]
Expense (benefit) for compliance with RFS	$ 86	$ (16)	$ 328	$ 335
RFS obligation	$ 715		$ 715		$ 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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