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Employee Benefit Plans (Net Periodic Benefit Cost) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]    
Expected return on plan assets $ (2,577) $ (2,482)
Defined benefit pension plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 30 41
Interest cost 111 80
Expected return on plan assets (161) (144)
Current year amortization of: Actuarial losses 1 8
Regulatory assets (liability) 6 21
Settlement, curtailments 2 2
Net Periodic Benefit Cost, Total (11) 8
Non-pension Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 3 4
Interest cost 13 9
Expected return on plan assets (2) 0
Current year amortization of: Actuarial losses (3) 0
Regulatory assets (liability) (2) 2
Settlement, curtailments 0 0
Net Periodic Benefit Cost, Total $ 9 $ 15