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Inventories - Summary of inventories (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Classes of current inventories [abstract]
Raw materials and purchased components	$ 675	$ 734
Consumable stores	925	862
Work in progress	1,066	1,026
Finished goods and goods for resale	936	977
Total inventories	3,602	3,599
Expected to be used within one year	3,463	3,447
Expected to be used after more than one year	$ 139	$ 152

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A classification of current inventory representing the amount of current raw materials and current production supplies. [Refer: Current production supplies; Current raw materials]

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A classification of current inventory representing the amount of goods that have completed the production process and are held for sale in the ordinary course of business. [Refer: Inventories]

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The amount of assets: (a) held for sale in the ordinary course of business; (b) in the process of production for such sale; or (c) in the form of materials or supplies to be consumed in the production process or in the rendering of services. Inventories encompass goods purchased and held for resale including, for example, merchandise purchased by a retailer and held for resale, or land and other property held for resale. Inventories also encompass finished goods produced, or work in progress being produced, by the entity and include materials and supplies awaiting use in the production process. [Refer: Current finished goods; Current merchandise; Current work in progress; Land]

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