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Leases - Disclosure Of Lease Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure Of Information Relating To Lease Liabilities Line Items [Line Items] |  |  |
Current | $ 34 | $ 65 | $ 55
Non-current | 416 | 595 | $ 615
Total | 450 | 660 |
US dollars [member] |  |  |
Disclosure Of Information Relating To Lease Liabilities Line Items [Line Items] |  |  |
Total | 385 | 514 |
Sterling [member] |  |  |
Disclosure Of Information Relating To Lease Liabilities Line Items [Line Items] |  |  |
Total | 10 | 52 |
Euros [member] |  |  |
Disclosure Of Information Relating To Lease Liabilities Line Items [Line Items] |  |  |
Total | 7 | 43 |
Others [member] |  |  |
Disclosure Of Information Relating To Lease Liabilities Line Items [Line Items] |  |  |
Total | $ 48 | $ 51 |

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- Definition The amount of current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
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Period Type: | instant

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of non-current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Disclosure Of Information Relating To Lease Liabilities Line Items + References No definition available. + Details
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- Details
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- Details
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- Details
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