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Employee future benefits - Actuarial Assumptions (Details) | Dec. 31, 2021 | Dec. 31, 2020
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Actuarial assumption of medical cost trend rates |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Percentage of reasonably possible increase in actuarial assumption | 1.00% |
Percentage of reasonably possible decrease in actuarial assumption | 1.00% |
Pension Plan |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Discount rate, fair value benefit obligation | 2.76% | 2.40%
Discount rate, net expense | 2.40% | 3.16%
Other post-retirement benefit plan |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Discount rate, fair value benefit obligation | 2.25% | 1.82%
Discount rate, net expense | 2.25% | 1.82%

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- Definition Actuarial Assumption Of Discount Rates, Net Expense + 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 2021-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard -URIDate 2021-03-24 + 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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_145_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_145_a&doctype=Standard -URIDate 2021-03-24 + Details
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