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Trade and other receivables - Summary of Movement in Allowance for Expected Lifetime Credit Losses of Trade and Other Receivables (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Statement [Line Items] |  |  |
Impairment loss on financial assets | $ 0 | $ 88 | $ 8
Exceptional Items [member] |  |  |
Statement [Line Items] |  |  |
Impairment loss on financial assets | $ 4 | $ 48 |

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- Definition The amount of impairment loss on financial assets. [Refer: Financial assets; Impairment loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 20 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_20_e&doctype=Standard&book=b -URIDate 2021-03-24 + Details
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- Definition Statement [Line Items] + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |