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Employee future benefits - Actuarial Assumptions (Details)	Dec. 31, 2021	Dec. 31, 2020
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%

X

- Definition

Actuarial Assumption Of Discount Rates, Net Expense

+ References

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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
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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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

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-Name IAS
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-IssueDate 2021-01-01
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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

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