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Investment in Associates and Joint Ventures - Summarised Aggregated Financial Information for Individually Immaterial Associates and Joint Ventures (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of investment in associates and joint ventures [line items] |  |  |
Operating profits before exceptional items | $ (1) | $ 7 | $ 7
Joint ventures [member] |  |  |
Disclosure of investment in associates and joint ventures [line items] |  |  |
Operating profits before exceptional items | 2 |  | 5
Associates [member] |  |  |
Disclosure of investment in associates and joint ventures [line items] |  |  |
Operating profits before exceptional items | $ (3) | $ 7 | $ 2

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- Definition The entity's share of the profit (loss) from continuing operations of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Continuing operations [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss) from continuing operations] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B16 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B16_a&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disclosure of investment in associates and joint ventures. + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |