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Employee Benefit Plans (Net Periodic Benefit Cost) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]    
Expected return on plan assets $ (2,482) $ (2,151)
Defined benefit pension plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 41 43
Interest cost 80 67
Expected return on plan assets (144) (132)
Current year amortization of: Actuarial losses 8 21
Regulatory assets (liability) 21 24
Settlement, curtailments 2 0
Net Periodic Benefit Cost, Total 8 23
Non-pension Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 4 5
Interest cost 9 8
Expected return on plan assets 0 (1)
Current year amortization of: Actuarial losses 0 3
Regulatory assets (liability) 2 2
Settlement, curtailments 0 0
Net Periodic Benefit Cost, Total $ 15 $ 17