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Employee benefit obligations - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase (decrease) in carrying amount of the pension obligations, assuming increase in actuarial assumption | $ 11 |
Best estimate of contributions expected to be paid to defined benefit schemes | $ 6 | $ 8
Discount rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Decrease in actuarial assumption (as a percent) | 0.50% |
Increase (decrease) in carrying amount of the pension obligations, assuming decrease in actuarial assumption | $ (19) | (21)
Increase in actuarial assumption (as a percent) | 0.50% |
Increase (decrease) in carrying amount of the pension obligations, assuming increase in actuarial assumption | $ 22 | 24
Inflation rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Decrease in actuarial assumption (as a percent) | 0.50% |
Increase (decrease) in carrying amount of the pension obligations, assuming decrease in actuarial assumption | $ (9) | (11)
Increase in actuarial assumption (as a percent) | 0.50% |
Increase (decrease) in carrying amount of the pension obligations, assuming increase in actuarial assumption | $ 10 | 12
Salary increase rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Decrease in actuarial assumption (as a percent) | 0.50% |
Increase (decrease) in carrying amount of the pension obligations, assuming decrease in actuarial assumption | $ (10) | (11)
Increase in actuarial assumption (as a percent) | 0.50% |
Increase (decrease) in carrying amount of the pension obligations, assuming increase in actuarial assumption |  | 12
Impact of increasing the life expectancy |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase (decrease) in carrying amount of the pension obligations, assuming increase in actuarial assumption | $ 6 | $ 7

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- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 147 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_147_b&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_148_d_iii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_145_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_145_a&doctype=Standard -URIDate 2024-03-27 + Details
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