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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
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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 |

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- 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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