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Pension Plans and Other Post-Retirement Benefits - Schedule of Sensitivity Analysis (Details)
$ in Millions
Dec. 31, 2022
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 $ 391
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption (309)
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 (39)
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption 44
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 64
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 20
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption (17)
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 (10)
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption 12
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 $ 3