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Employee Benefit Plans (Net amount in AOCI and regulatory assets) (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Regulatory assets $ 1,584 $ 1,552
Defined benefit pension plans    
Defined Benefit Plan Disclosure [Line Items]    
Actuarial losses 160 160
Past service (gains) 0 (1)
Regulatory assets 279 358
Accumulated Other Comprehensive Income (Loss), before Tax, Total 439 517
Amount included in deferred income tax 4 7
Net amount in AOCI after tax adjustment 443 524
Non-pension Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Actuarial losses (4) (5)
Past service (gains) 0 0
Regulatory assets 110 78
Accumulated Other Comprehensive Income (Loss), before Tax, Total 106 73
Amount included in deferred income tax 1 1
Net amount in AOCI after tax adjustment $ 107 $ 72