Inventories - Schedule of Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Crude oil and natural gas	$ 611	$ 647
Materials and supplies	563	561
Total Inventories	1,174	1,208
Inventories valued on the LIFO basis	$ 353	$ 395

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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-Publisher FASB
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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 LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

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