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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, 2023
Dec. 31, 2022
Defined benefit pension plans    
Change in Projected Benefit Obligation ("PBO") and Accumulated Post-retirement Benefit Obligation ("APBO")    
Benefit Obligation, Beginning Balance $ 2,158 $ 2,624
Service cost 30 41
Plan participant contributions 6 6
Interest cost 111 80
Plan amendments 0 0
Benefits Paid (147) (174)
Actuarial losses (gains) 146 (480)
Settlements and curtailments (8) (6)
Foreign currency translation adjustment (23) 67
Benefit Obligation, Ending Balance 2,273 2,158
Change in plan assets    
Plan Assets, Beginning Balance 2,163 2,702
Employer contributions 42 45
Plan participant contributions 6 6
Benefits paid (147) (174)
Actual return on assets, net of expenses 262 (489)
Settlements and curtailments (8) (6)
FX translation adjustment (20) 79
Plan Assets, Ending Balance 2,298 2,163
Funded Status    
Funded status, end of year 25 5
Non-pension Benefit Plans    
Change in Projected Benefit Obligation ("PBO") and Accumulated Post-retirement Benefit Obligation ("APBO")    
Benefit Obligation, Beginning Balance 243 318
Service cost 3 4
Plan participant contributions 6 6
Interest cost 13 9
Plan amendments (14) 0
Benefits Paid (29) (31)
Actuarial losses (gains) 10 (79)
Settlements and curtailments 0 0
Foreign currency translation adjustment (5) 16
Benefit Obligation, Ending Balance 227 243
Change in plan assets    
Plan Assets, Beginning Balance 46 51
Employer contributions 23 24
Plan participant contributions 6 6
Benefits paid (29) (31)
Actual return on assets, net of expenses 3 (7)
Settlements and curtailments 0 0
FX translation adjustment (1) 3
Plan Assets, Ending Balance 48 46
Funded Status    
Funded status, end of year $ (179) $ (197)