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Inventories (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Classes of current inventories [abstract]
Crude oil	$ 2,137	$ 1,173
Petroleum products	572	345
Natural gas	277	274
Other	377	351
Inventories	3,363	2,144
Inventory write-down	$ 147	$ 164

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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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