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Employee Benefit Plans (Net Periodic Benefit Cost) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]    
Expected return on plan assets $ (2,571) $ (2,577)
Defined benefit pension plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 35 30
Interest cost 110 111
Expected return on plan assets (160) (161)
Current year amortization of: Actuarial losses (gains) 3 1
Current year amortization of: Past service costs (gains) 0 0
Regulatory assets (liability) 9 6
Settlement, curtailments 0 2
Net Periodic Benefit Cost, Total (3) (11)
Non-pension Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 3 3
Interest cost 12 13
Expected return on plan assets (2) (2)
Current year amortization of: Actuarial losses (gains) (2) (3)
Current year amortization of: Past service costs (gains) (2) 0
Regulatory assets (liability) (2) (2)
Settlement, curtailments 1 0
Net Periodic Benefit Cost, Total $ 8 $ 9