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Financial instruments disclosures - Summary of changes in fair value of Level 3 financial assets and financial liabilities (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Disclosure of detailed information about financial instruments [line items]
Currency translation adjustments	$ (109)
Level 3
Disclosure of detailed information about financial instruments [line items]
Opening balance	395
Currency translation adjustments	(3)
– consolidated sales revenue	15
– net operating costs	(18)
– net operating costs	33
Total unrealised gains transferred into other comprehensive income	(172)
Disposals/maturity of financial instruments	(3)
Closing balance	247
Net gains included in the income statement for assets and liabilities held at period end	$ 26

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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Adjustment on currency translation.

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- Definition

Disposal or maturity of financial instruments.

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- Definition

Financial assets and financial liabilities at fair value.

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Gains (losses) recognised in profit or loss for assets and liabilities held.

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- Definition

Total realised gains or losses related to Level 3 financial assets and liabilities included in consolidated sales revenue.

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Total realised gains or losses related to Level 3 financial assets and liabilities included in net operating costs.

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Unrealised gain or loss transferred into other comprehensive income.

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Total unrealised gains related to Level 3 financial assets and liabilities included in net operating costs.

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