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Post-retirement benefits - Results summary of sensitivity analysis (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Discount rate | Pension benefits |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase of percentage points | 50.00% | 50.00%
Decrease of percentage points | 50.00% | 50.00%
Increase of actuarial assumption | $ 419 | $ 460
Decrease of actuarial assumption | $ (487) | $ (514)
Discount rate | Other benefits |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase of percentage points | 50.00% | 50.00%
Decrease of percentage points | 50.00% | 50.00%
Increase of actuarial assumption | $ 31 | $ 31
Decrease of actuarial assumption | $ (33) | $ (33)
Long-term inflation | Pension benefits |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase of percentage points | 50.00% | 50.00%
Decrease of percentage points | 50.00% | 50.00%
Increase of actuarial assumption | $ (167) | $ (183)
Decrease of actuarial assumption | $ 160 | $ 176
Long-term inflation | Other benefits |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase of percentage points | 50.00% | 50.00%
Decrease of percentage points | 50.00% | 50.00%
Increase of actuarial assumption | $ (9) | $ (9)
Decrease of actuarial assumption | $ 8 | $ 8
Demographic – allowance for future improvements in longevity | Pension benefits |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase in actuarial assumption of longevity trend | 1 year | 1 year
Decrease in actuarial assumption of longevity trend | 1 year | 1 year
Increase of actuarial assumption | $ 221 | $ 244
Decrease of actuarial assumption | $ (232) | $ (244)
Demographic – allowance for future improvements in longevity | Other benefits |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase in actuarial assumption of longevity trend | 1 year | 1 year
Decrease in actuarial assumption of longevity trend | 1 year | 1 year
Increase of actuarial assumption | $ 8 | $ 7
Decrease of actuarial assumption | $ (8) | $ (7)

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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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- Definition The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [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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