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Post-employment benefits for employees (Details 5) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Discount rate | 25 basis point change |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | $ (466) | $ (790)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 491 | 839
Life expectancy | 1 year increase |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | 535 | 869
Rate of pension increase | 25 basis point change |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | 316 | 512
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | (63) | (136)
Interest on savings account | 25 basis point change |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | 38 | 58
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | (37) | (58)
Salary increase | 25 basis point change |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | 37 | 54
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ (37) | $ (54)

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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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard -URIDate 2022-03-24 + 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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard -URIDate 2022-03-24 + Details
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