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Employee Benefit Plans (Net Periodic Benefit Cost) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Expected return on plan assets $ (2,401) $ (2,223)
Defined benefit pension plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 47 51
Interest cost 102 95
Expected return on plan assets (147) (138)
Current year amortization of: Actuarial losses 16 33
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (1) (1)
Regulatory assets (liability) 26 20
Settlement, curtailments 1 4
Net Periodic Benefit Cost, Total 38 70
Non-pension Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 4 6
Interest cost 14 13
Expected return on plan assets (2) (2)
Current year amortization of: Actuarial losses 0 (1)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 0
Regulatory assets (liability) (2) (5)
Settlement, curtailments 0 0
Net Periodic Benefit Cost, Total $ 11 $ 14