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Commitments and Contingencies - Renewable Fuel Standard (Details) $ in Millions		3 Months Ended		9 Months Ended		60 Months Ended
	Aug. 22, 2025	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Loss Contingencies [Line Items]
Waiver percentage, year one	1
Waiver percentage, year three	1
Waiver percentage, year two	0.50
Waiver percentage, year four	0.50
Waiver percentage, year five	0.50
Waiver percentage, year six	0.50
RIN oblication, reduced						$ 424
Increase (decrease) accrued obligation		$ (488)		$ (488)
Petroleum Segment | Environmental, Health, and Safety Matters
Loss Contingencies [Line Items]
Expense (benefit) for compliance with RFS		(417)	$ 86	(171)	$ 65
RFS obligation		$ 93		$ 93		$ 323

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