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Employee Benefit Plans (Net Periodic Benefit Cost) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Expected return on plan assets $ (2,476) $ (2,401)
Defined benefit pension plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 46 47
Interest cost 84 102
Expected return on plan assets (141) (147)
Current year amortization of: Actuarial losses 15 16
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (1) (1)
Regulatory assets (liability) 25 20
Settlement, curtailments 0 1
Net Periodic Benefit Cost, Total 28 38
Non-pension Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 5 4
Interest cost 10 14
Expected return on plan assets (1) (2)
Current year amortization of: Actuarial losses 0 0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 0
Regulatory assets (liability) 0 (5)
Settlement, curtailments 0 0
Net Periodic Benefit Cost, Total $ 14 $ 11