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Commitments and Contingencies - Renewable Fuel Standard (Details) - Petroleum Segment - Environmental, Health, and Safety Matters - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Loss Contingencies [Line Items]
Expense (benefit) for compliance with RFS	$ 123	$ 30	$ 246	$ (21)
RFS obligation	$ 548		$ 548		$ 323

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