Inventories (Details) - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2026	Dec. 31, 2025
Schedule of Inventories
Refinery feedstocks	$ 1,535	$ 1,880
Refined petroleum products and blendstocks	4,168	4,182
Renewable diesel feedstocks and products	1,185	809
Ethanol feedstocks and products	329	314
Materials and supplies	408	406
Inventories	7,625	7,591
Inventory [Line Items]
Excess of market value over carrying amount of LIFO inventories	7,500	2,600
Amount of non-LIFO inventory	1,300	$ 1,200
California Refineries [Member]
Inventory [Line Items]
Increase (decrease) of LIFO inventory on liquidation on income	$ 44

The aggregate carrying amount as of the balance sheet date of unrefined petroleum and the liquid hydrocarbon components recovered from natural gas.

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

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The excess of replacement or current cost over the stated LIFO (last in first out) inventory value when the LIFO inventory method is utilized.

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Carrying amount as of the balance sheet date of finished goods inventories for petroleum products, crude oil, petrochemical products, and other oil and gas inventories.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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The amount of weighted average cost inventory present at the reporting date when inventory is valued using different valuation methods.

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Carrying amount as of the balance sheet date of ethanol feedstocks and products.

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Carrying amount as of the balance sheet date of renewable diesel feedstocks and products.

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