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Inventories (Details) - USD ($) $ in Millions	1 Months Ended			3 Months Ended		12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Inventories
Refinery feedstocks	$ 1,979					$ 1,979	$ 2,399
Refined petroleum products and blendstocks	3,425					3,425	4,034
Renewable diesel feedstocks and products	50					50	46
Ethanol feedstocks and products	297					297	260
Materials and supplies	287					287	274
Inventories	6,038					6,038	7,013
Inventories (Textual)
LCM inventory valuation reserve			$ 2,500
Lower of cost or market (LCM) inventory valuation adjustment			$ 2,500	$ (300)	$ (2,200)	(19)	0	$ 0
Excess of market value over carrying amount of LIFO inventories	1,300					1,300	2,500
Liquidation of LIFO inventory, increase to cost of materials and other	(102)	$ 326				224
Amount of non-LIFO inventory	$ 918					$ 918	$ 1,400

X

- Definition

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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Amount of valuation reserve for inventory.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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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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