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Inventories - Additional information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Classes Of Inventories [Line Items]
Inventory write-downs, net of reversals	$ 42	$ 48
Decrease through write-off, financial assets	134
Inventories pledged as security for liabilities	611	$ 566
Previously stated [member]
Classes Of Inventories [Line Items]
Net inventory write- back	$ 92

X

- Definition

The decrease in financial assets resulting from write-off. [Refer: Financial assets]

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- Definition

The amount of inventories pledged as security for liabilities. [Refer: Inventories]

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- Definition

The amount recognised as a reduction in the amount of inventories recognised as an expense due to the reversal of any write-down of inventories resulting from an increase in net realisable value. [Refer: Inventories; Inventory write-down]

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The amount recognised resulting from the write-down of inventories to net realisable value or reversals of those write-downs. [Refer: Inventories]

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