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Employee Benefit Plans (Changes in Benefit Obligation and Plan Assets and Funded Status) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Defined benefit pension plans    
Change in Projected Benefit Obligation ("PBO") and Accumulated Post-retirement Benefit Obligation ("APBO")    
Benefit Obligation, Beginning Balance $ 2,273 $ 2,158
Service cost 35 30
Plan participant contributions 6 6
Interest cost 110 111
Plan amendments 0 0
Benefits Paid (153) (147)
Actuarial losses (gains) 13 146
Settlements and curtailments 0 (8)
Foreign currency translation adjustment 83 (23)
Benefit Obligation, Ending Balance 2,367 2,273
Change in plan assets    
Plan Assets, Beginning Balance 2,298 2,163
Employer contributions 36 42
Plan participant contributions 6 6
Benefits paid (153) (147)
Actual return on assets, net of expenses 226 262
Settlements and curtailments 0 (8)
FX translation adjustment 80 (20)
Plan Assets, Ending Balance 2,493 2,298
Funded Status    
Funded status, end of year 126 25
Non-pension Benefit Plans    
Change in Projected Benefit Obligation ("PBO") and Accumulated Post-retirement Benefit Obligation ("APBO")    
Benefit Obligation, Beginning Balance 227 243
Service cost 3 3
Plan participant contributions 5 6
Interest cost 12 13
Plan amendments 0 (14)
Benefits Paid (21) (29)
Actuarial losses (gains) (3) 10
Settlements and curtailments 0 0
Foreign currency translation adjustment 18 (5)
Benefit Obligation, Ending Balance 241 227
Change in plan assets    
Plan Assets, Beginning Balance 48 46
Employer contributions 13 23
Plan participant contributions 5 6
Benefits paid (21) (29)
Actual return on assets, net of expenses 4 3
Settlements and curtailments 0 0
FX translation adjustment 5 (1)
Plan Assets, Ending Balance 54 48
Funded Status    
Funded status, end of year $ (187) $ (179)