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Impairment and Other Matters (Details) - USD ($) $ in Millions	3 Months Ended					6 Months Ended
	Jun. 30, 2026	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2026	Jun. 30, 2025
Impairment (Textual)
Asset impairment loss	$ 0			$ 0		$ 0	$ 1,131
California Refineries [Member]
Impairment (Textual)
Increase (decrease) of LIFO inventory on liquidation on income	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)
Increase (decrease) of LIFO inventory on liquidation on income	44	$ (37)				44
Operating Segments [Member] | Refining [Member] | Benicia Refinery [Member] | One-time Termination Benefits [Member]
Impairment (Textual)
Retention and separation benefit liability			$ 50
One-time costs			$ 50
Operating Segments [Member] | Refining [Member] | Benicia Refinery [Member]
Impairment (Textual)
Asset retirement obligation, liabilities settled	70					170
Incremental depreciation	$ 33			$ 100		$ 133	$ 100

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Amount of asset retirement obligations incurred during the period.

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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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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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