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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Loss Contingencies [Line Items]
Expense (benefit) for compliance with RFS	$ (16)	$ 36	$ 335	$ 71
RFS obligation	$ 442		$ 442		$ 214

X

- 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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- Details

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