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Employee benefits (Details 10) - Overfunded Pension Plans [Member] - Level 3 of fair value hierarchy [member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
IfrsStatementLineItems [Line Items] |  |
Assets as at beginning of the year | $ 664 | $ 426
Return on plan assets | 36 | 34
Assets purchases | 230 | 315
Assets sold during the year | (235) | (350)
Translation adjustment | 37 | 26
Transfer between Overfunded pension and Underfunded pension plans | (76) | 213
Assets as at end of the year | 656 | 664
Trading equity securities [member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets as at beginning of the year | 240 | 103
Return on plan assets | 5 | (5)
Assets purchases | 11 | 10
Assets sold during the year | (6) | (36)
Translation adjustment | 8 | 4
Transfer between Overfunded pension and Underfunded pension plans | (58) | 164
Assets as at end of the year | 200 | 240
Ifrs Real Estate Funds [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets as at beginning of the year | 3 | 5
Return on plan assets |  | (2)
Assets sold during the year | (3) |
Assets as at end of the year |  | 3
Investment property [member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets as at beginning of the year | 293 | 212
Return on plan assets | 9 | 15
Assets purchases | 8 | 25
Assets sold during the year | (16) | (22)
Translation adjustment | 18 | 14
Transfer between Overfunded pension and Underfunded pension plans | (18) | 49
Assets as at end of the year | 294 | 293
Loan To Participants [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets as at beginning of the year | 128 | 106
Return on plan assets | 22 | 26
Assets purchases | 211 | 280
Assets sold during the year | (210) | (292)
Translation adjustment | 11 | 8
Assets as at end of the year | $ 162 | $ 128

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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 2023-01-01 -Paragraph 93 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2023-en-r&anchor=para_93_e_i&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2023-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2023-03-23 + Details
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