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Employee Benefit Plans (Changes in Benefit Obligation and Plan Assets and the Funded Status) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Defined benefit pension plans    
Change in Projected Benefit Obligation ("PBO") and Accumulated Post-retirement Benefit Obligation ("APBO")    
Benefit Obligation, Beginning Balance $ 2,624 $ 2,759
Service cost 41 43
Plan participant contributions 6 6
Interest cost 80 67
Benefits Paid (174) (160)
Actuarial losses (480) (89)
Settlements and curtailments (6) 0
Foreign currency translation adjustment 67 (2)
Benefit Obligation, Ending Balance 2,158 2,624
Change in plan assets    
Plan Assets, Beginning Balance 2,702 2,605
Employer contributions 45 42
Plan participant contributions 6 6
Benefits paid (174) (160)
Actual return on assets, net of expenses (489) 214
Settlements and curtailments (6) 0
Foreign currency translation adjustment 79 (5)
Plan Assets, Ending Balance 2,163 2,702
Funded Status    
Funded status, end of year 5 78
Non-pension Benefit Plans    
Change in Projected Benefit Obligation ("PBO") and Accumulated Post-retirement Benefit Obligation ("APBO")    
Benefit Obligation, Beginning Balance 318 339
Service cost 4 5
Plan participant contributions 6 4
Interest cost 9 8
Benefits Paid (31) (27)
Actuarial losses (79) (10)
Settlements and curtailments 0 0
Foreign currency translation adjustment 16 (1)
Benefit Obligation, Ending Balance 243 318
Change in plan assets    
Plan Assets, Beginning Balance 51 52
Employer contributions 24 21
Plan participant contributions 6 4
Benefits paid (31) (27)
Actual return on assets, net of expenses (7) 2
Settlements and curtailments 0 0
Foreign currency translation adjustment 3 (1)
Plan Assets, Ending Balance 46 51
Funded Status    
Funded status, end of year $ (197) $ (267)