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Inventories (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Inventories [abstract]
Crude oil	$ 2,022	$ 2,137
Petroleum products	443	572
Natural gas	229	277
Other	390	377
Inventories	3,084	3,363
Inventory write-down	$ 58	$ 147

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A classification of current inventory representing the amount of unrefined, unprocessed oil. [Refer: Inventories]

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A classification of current inventory representing the amount of a naturally occurring hydrocarbon gas mixture. [Refer: Inventories]

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A classification of current inventory representing the amount of products derived from crude oil and natural gas. [Refer: Current crude oil; Current natural gas]

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The amount of current inventories. [Refer: Inventories]

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The amount of expense recognised related to the write-down of inventories to net realisable value. [Refer: Inventories]

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The amount of inventory that the entity does not separately disclose in the same statement or note. [Refer: Inventories]

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