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Employee benefits (Details 6) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Overfunded Pension Plans [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Service cost | $ 16 | $ 45 | $ 10
Interest expense | 322 | 325 | 196
Interest income | (429) | (412) | (253)
Interest expense on effect of (asset ceiling)/ onerous liability | 103 | 84 | 58
Others | 3 |  |
Total of cost, net | 15 | 42 | 11
Underfunded Pension Plans [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Service cost | 15 | 40 | 68
Interest expense | 103 | 39 | 122
Interest income | (85) | (17) | (102)
Interest expense on effect of (asset ceiling)/ onerous liability | 1 |  |
Others | 10 |  |
Total of cost, net | 44 | 62 | 88
Other Benefits [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Service cost | 8 | 13 | 1
Interest expense | 68 | 60 | 33
Interest income |  |  |
Interest expense on effect of (asset ceiling)/ onerous liability |  |  |
Others | (2) |  |
Total of cost, net | $ 74 | $ 73 | $ 34

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- Definition The amount of post-employment benefit expense included in profit or loss relating to defined benefit plans. [Refer: Profit (loss); Defined benefit plans [member]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 5 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_5&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_135_b&doctype=Standard -URIDate 2023-03-23 + Details
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