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Employee Benefit Plans (Net amount in AOCI and regulatory assets) (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]    
Regulatory assets $ 3,620 $ 2,566
Defined benefit pension plans    
Defined Benefit Plan Disclosure [Line Items]    
Actuarial losses 15 30
Deferred income tax expense (recovery) 7 8
AOCI, net of tax 22 38
Regulatory assets 336 192
AOCI, net of tax and regulatory assets 358 230
Non-pension Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Actuarial losses (10) 0
Deferred income tax expense (recovery) 1 (1)
AOCI, net of tax (9) (1)
Regulatory assets 31 91
AOCI, net of tax and regulatory assets $ 22 $ 90