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Post-employment benefit plans - Significant Assumptions (Details) - year | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Post-employment benefit obligations |  |
Discount rate | 4.60% | 5.30%
Rate of compensation increase | 2.25% | 2.25%
Cost of living indexation rate | 1.60% | 1.60%
Life expectancy at age 65 (years) | 23.4 | 23.3
Net post-employment benefit plans cost |  |
Discount rate | 5.30% | 3.40%
Rate of compensation increase | 2.25% | 2.25%
Cost of living indexation rate | 1.60% | 1.60%
Life expectancy at age 65 (years) | 23.3 | 23.3
Weighted average duration of defined benefit obligation | 12 years |
Cost of medication |  |
Net post-employment benefit plans cost |  |
Actuarial assumption of medical cost trend rates | 6.50% |
Ultimate actuarial assumption of medical cost trend rates | 4.00% |
Term to reach ultimate actuarial assumption of medical cost trend rate | 20 years |
Cost of covered dental benefits |  |
Net post-employment benefit plans cost |  |
Actuarial assumption of medical cost trend rates | 4.50% |
Cost of covered hospital benefits |  |
Net post-employment benefit plans cost |  |
Actuarial assumption of medical cost trend rates | 3.70% |
Cost of other covered healthcare benefits |  |
Net post-employment benefit plans cost |  |
Actuarial assumption of medical cost trend rates | 4.50% |

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- Definition Actuarial Assumption Of Discount Rates, Used to Calculate Post-employment Benefit Expense + References No definition available. + Details
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- Definition Actuarial Assumption Of Expected Rates Of Inflation, Used To Calculate Post-Employment Benefit Expense + References No definition available. + Details
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- Definition Actuarial Assumption Of Expected Rates Of Salary Increases, Used To Calculate Post-Employment Benefit Expense + References No definition available. + Details
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- Definition Actuarial Assumption Of Life Expectancy After Retirement, Used To Calculate Post-Employment Benefit Expense + References No definition available. + Details
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- Definition Actuarial Assumption To Measure Post-Employment Benefit Obligations [Abstract] + References No definition available. + Details
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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_144&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_144&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Medical cost trend rate used as significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_144&doctype=Standard -URIDate 2023-03-23 + Details
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