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Employee Benefit Plans (Amounts Recognized in AOCI and Regulatory Assets) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Change in AOCI and Regulatory Assets    
Regulatory assets $ 3,105 $ 3,620
Defined benefit pension plans    
Change in AOCI and Regulatory Assets    
Beginning Balance 22  
Amortized in current period 1 8
Ending Balance 61 22
Actuarial losses 53 15
Past service gains 0 0
Deferred income tax expense (recovery) 8 7
AOCI, net of tax 61 22
Regulatory assets 324 336
AOCI, net of tax and regulatory assets 385 358
Defined benefit pension plans | Regulatory | Assets    
Change in AOCI and Regulatory Assets    
Beginning Balance 336  
Amortized in current period (6)  
Current year additions (reductions) 1  
Change in FX rate (7)  
Ending Balance 324 336
Defined benefit pension plans | Actuarial (gains) losses    
Change in AOCI and Regulatory Assets    
Beginning Balance 15  
Amortized in current period (3)  
Current year additions (reductions) 41  
Change in FX rate 0  
Ending Balance 53 15
Defined benefit pension plans | Past service costs (gains)    
Change in AOCI and Regulatory Assets    
Beginning Balance 0  
Amortized in current period 0  
Current year additions (reductions) 0  
Change in FX rate 0  
Ending Balance 0 0
Non-pension Benefit Plans    
Change in AOCI and Regulatory Assets    
Beginning Balance (9)  
Amortized in current period (3) 0
Ending Balance (9) (9)
Actuarial losses (8) (10)
Past service gains (2) 0
Deferred income tax expense (recovery) 1 1
AOCI, net of tax (9) (9)
Regulatory assets 29 31
AOCI, net of tax and regulatory assets 20 22
Non-pension Benefit Plans | Regulatory | Assets    
Change in AOCI and Regulatory Assets    
Beginning Balance 31  
Amortized in current period 2  
Current year additions (reductions) (3)  
Change in FX rate (1)  
Ending Balance 29 31
Non-pension Benefit Plans | Actuarial (gains) losses    
Change in AOCI and Regulatory Assets    
Beginning Balance (10)  
Amortized in current period 3  
Current year additions (reductions) (1)  
Change in FX rate 0  
Ending Balance (8) (10)
Non-pension Benefit Plans | Actuarial (gains) losses | Assets    
Change in AOCI and Regulatory Assets    
Beginning Balance 0  
Amortized in current period 0  
Current year additions (reductions) (3)  
Change in FX rate 1  
Ending Balance (2) 0
Non-pension Benefit Plans | Past service costs (gains)    
Change in AOCI and Regulatory Assets    
Beginning Balance 0  
Amortized in current period 0  
Current year additions (reductions) (3)  
Change in FX rate 1  
Ending Balance $ (2) $ 0