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Pension Plans and Other Post-Retirement Benefits - Schedule of Sensitivity Analysis (Details)
$ in Millions
Dec. 31, 2021
CAD ($)
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