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Amount of asset retirement obligations incurred during the period.

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The effect of liquidating LIFO (last in first out) inventory layers on income.

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Amount of impairment loss for long-lived asset held and used. Includes, but is not limited to, impairment loss for long-lived asset to be disposed of other than by sale.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Impairment and Other Matters (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Mar. 31, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Impairment (Textual)
Asset impairment loss	$ 0	$ 0		$ 0	$ 1,131
California Refineries [Member]
Impairment (Textual)
Liquidation of LIFO inventory, cost increase (decrease)				44
Operating Segments [Member] \| Refining [Member]
Impairment (Textual)
Asset impairment loss			$ 1,100		1,131
Asset retirement obligation, liabilities incurred			$ 337		337
Operating Segments [Member] \| Refining [Member] \| California Refineries [Member]
Impairment (Textual)
Liquidation of LIFO inventory, cost increase (decrease)				44		$ (37)
Operating Segments [Member] \| Refining [Member] \| Benicia Refinery [Member] \| One-time Termination Benefits [Member]
Impairment (Textual)
Retention and separation benefit liability		50			50
One-time costs		50
Operating Segments [Member] \| Refining [Member] \| Benicia Refinery [Member]
Impairment (Textual)
Asset retirement obligation, liabilities settled	$ 19			189
Incremental depreciation		$ 100		$ 133	$ 200