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Financial risk management and derivative financial instruments - Summary of Derivative Financial Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Derivative Financial Instruments [line items]
Derivative financial instruments	$ (13)	$ (19)
Non-current Assets [member]
Disclosure Of Derivative Financial Instruments [line items]
Derivative financial instruments	5
Current assets [member]
Disclosure Of Derivative Financial Instruments [line items]
Derivative financial instruments		1
Non-current liabilities [member]
Disclosure Of Derivative Financial Instruments [line items]
Derivative financial instruments	(18)	(20)
Short-dated foreign exchange swaps [Member]
Disclosure Of Derivative Financial Instruments [line items]
Derivative financial instruments		1
Currency swaps [member]
Disclosure Of Derivative Financial Instruments [line items]
Derivative financial instruments	(17)	$ (20)
Option contract [member]
Disclosure Of Derivative Financial Instruments [line items]
Derivative financial instruments	$ 4

X

- Definition

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard
-URIDate 2020-01-01

+ Details

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- Definition

Disclosure Of Derivative Financial Instruments [line items]

+ References

No definition available.

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