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Pension Plans and Other Post-Retirement Benefits - Schedule of Sensitivity Analysis (Details) $ in Millions | Dec. 31, 2021 CAD ($)
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Interest/discount rate sensitivity |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Percentage of reasonably possible decrease in actuarial assumption | 1.00%
Percentage of reasonably possible increase in actuarial assumption | 1.00%
Rate of compensation increase assumption |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Percentage of reasonably possible decrease in actuarial assumption | 1.00%
Percentage of reasonably possible increase in actuarial assumption | 1.00%
Health care trend rate assumption |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Percentage of reasonably possible decrease in actuarial assumption | 1.00%
Percentage of reasonably possible increase in actuarial assumption | 1.00%
Mortality rates |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Percentage of reasonably possible decrease in actuarial assumption | 10.00%
Pension | Interest/discount rate sensitivity |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ 694
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | (550)
Pension | Rate of compensation increase assumption |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | (68)
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | 76
Pension | Mortality rates |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 103
Post-retirement benefits | Interest/discount rate sensitivity |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 30
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | (26)
Post-retirement benefits | Health care trend rate assumption |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | (12)
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | 13
Post-retirement benefits | Mortality rates |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ 6

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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 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 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 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 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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