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Provisions - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of other provisions [abstract] |  |  |
Insurance revenue | $ 19 | $ 19 | $ 11
Claims expense | 16 | $ 18 | $ 10
Prior period potential exposure for individual insurance claims | 4 |  |
Potential exposure to aggregate insurance claims since 2011 | $ 40 |  |

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- Definition The amount of expense arising from insurance contracts. [Refer: Types of insurance contracts [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2020-01-01 -Paragraph 37 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2020-en-b&anchor=para_37_b&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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- Definition The amount of income arising from insurance contracts. [Refer: Types of insurance contracts [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2020-01-01 -Paragraph 37 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2020-en-b&anchor=para_37_b&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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- Definition Potential exposire to aggregate insurance claims since 2011. + References No definition available. + Details
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- Definition Potential exposure to individual insurance claims prior to 2011. + References No definition available. + Details
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