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Financial risk management and derivative financial instruments - Summary of Derivative Financial Instruments (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure Of Derivative Financial Instruments [line items] |  |
Derivative financial instruments | $ 1 | $ 8
Non-current derivative financial assets |  | 7
Current derivative financial assets | 1 | 1
Non-current liabilities | (20) |
Hedging instruments [member] |  |
Disclosure Of Derivative Financial Instruments [line items] |  |
Derivative financial instruments | (19) | 8
Non-current Assets [member] | Hedging instruments [member] |  |
Disclosure Of Derivative Financial Instruments [line items] |  |
Non-current derivative financial assets |  | 7
Current assets [member] | Hedging instruments [member] |  |
Disclosure Of Derivative Financial Instruments [line items] |  |
Current derivative financial assets | 1 | 1
Non-current liabilities [member] | Hedging instruments [member] |  |
Disclosure Of Derivative Financial Instruments [line items] |  |
Non-current liabilities | (20) |
Short-dated foreign exchange swaps [Member] | Hedging instruments [member] |  |
Disclosure Of Derivative Financial Instruments [line items] |  |
Derivative financial instruments | 1 | 1
Currency swaps [member] | Hedging instruments [member] |  |
Disclosure Of Derivative Financial Instruments [line items] |  |
Derivative financial instruments | $ (20) | $ 7

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- Definition The amount of current derivative financial assets. [Refer: Derivative financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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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 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of non-current derivative financial assets. [Refer: Derivative financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of non-current derivative financial liabilities. [Refer: Derivative financial liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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