Inventories - Schedule of Lower of Cost or Market Reserve Activity (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Inventory Valuation Reserves [Roll Forward]
Beginning balance	$ 289
Lower of cost or market inventory valuation adjustments	97
Ending balance	386
Refining
Inventory Valuation Reserves [Roll Forward]
Beginning balance	189
Lower of cost or market inventory valuation adjustments	102
Ending balance	291
Renewables
Inventory Valuation Reserves [Roll Forward]
Beginning balance	100
Lower of cost or market inventory valuation adjustments	(5)
Ending balance	$ 95