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Employee Benefit Plans (Net amount in AOCI and regulatory assets) (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Regulatory assets $ 1,552 $ 1,569
Defined benefit pension plans    
Defined Benefit Plan Disclosure [Line Items]    
Actuarial losses 160 246
Past service (gains) (1) (2)
Regulatory assets 358 389
Accumulated Other Comprehensive Income (Loss), before Tax, Total 517 633
Amount included in deferred income tax   7
Amount included in deferred income tax (5)  
Net amount in AOCI after tax adjustment 524 628
Non-pension Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Actuarial losses (5) (7)
Past service (gains) 0 0
Regulatory assets 78 65
Accumulated Other Comprehensive Income (Loss), before Tax, Total 73 58
Amount included in deferred income tax 2  
Amount included in deferred income tax   (1)
Net amount in AOCI after tax adjustment $ 72 $ 60