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Employee benefits - Overfunded pension plans - Measurement of assets at fair value (Details) - Level 3 of fair value hierarchy [member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
IfrsStatementLineItems [Line Items] |  |
Return on plan assets | $ (13) |
Overfunded Pension Plans [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets as at beginning of the year | 426 | $ 491
Return on plan assets | 34 | 11
Assets purchases | 315 | 71
Assets sold during the year | (350) | (113)
Translation adjustment | 26 | (34)
Transfer | 213 |
Assets as at end of the year | 664 | 426
Trading equity securities [member] | Overfunded Pension Plans [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets as at beginning of the year | 103 | 126
Return on plan assets | (5) | 10
Assets purchases | 10 | 28
Assets sold during the year | (36) | (25)
Translation adjustment | 4 | (8)
Transfer | 164 |
Assets as at end of the year | 240 | 103
Ifrs Real Estate Funds [Member] | Overfunded Pension Plans [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets as at beginning of the year | 5 | 5
Return on plan assets | (2) |
Assets as at end of the year | 3 | 5
Investment property [member] | Overfunded Pension Plans [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets as at beginning of the year | 212 | 255
Return on plan assets | 15 | (15)
Assets purchases | 25 | 4
Assets sold during the year | (22) | (14)
Translation adjustment | 14 | (18)
Transfer | 49 |
Assets as at end of the year | 293 | 212
Loan To Participants [Member] | Overfunded Pension Plans [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets as at beginning of the year | 106 | 105
Return on plan assets | 26 | 16
Assets purchases | 280 | 67
Assets sold during the year | (292) | (74)
Translation adjustment | 8 | (8)
Assets as at end of the year | $ 128 | $ 106

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- Definition The gains (losses) excluding exchange differences, recognised in profit or loss, on the fair value measurement of assets. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 13 -IssueDate 2022-03-24 -Paragraph 93 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2022-en-r&anchor=para_93_e_i&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The increase in the fair value measurement of assets resulting from purchases of those assets. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2022-03-24 -Paragraph 93 -Subparagraph e -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2022-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2022-03-24 + Details
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