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Employee Benefit Plans (Amounts Recognized in AOCI and Regulatory Assets) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Change in AOCI and Regulatory Assets    
Beginning Balance $ 12,088 $ 11,441
Ending Balance 13,291 12,088
Regulatory assets 3,427 3,105
Defined benefit pension plans    
Change in AOCI and Regulatory Assets    
Beginning Balance 61  
Amortized in current period 3 1
Ending Balance (9) 61
Actuarial (gains) losses (17) 53
Past service gains 0 0
Deferred income tax expense (recovery) 8 8
AOCI, net of tax (9) 61
Regulatory assets 363 324
AOCI, net of tax and regulatory assets 354 385
Defined benefit pension plans | Regulatory | Assets    
Change in AOCI and Regulatory Assets    
Beginning Balance 324  
Amortized in current period (9)  
Current year additions (reductions) 19  
Change in FX rate 29  
Ending Balance 363 324
Defined benefit pension plans | Actuarial (gains) losses    
Change in AOCI and Regulatory Assets    
Beginning Balance 53  
Amortized in current period (3)  
Current year additions (reductions) (67)  
Change in FX rate 0  
Ending Balance (17) 53
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 (2) (3)
Ending Balance (7) (9)
Actuarial (gains) losses (8) (8)
Past service gains 0 (2)
Deferred income tax expense (recovery) 1 1
AOCI, net of tax (7) (9)
Regulatory assets 29 29
AOCI, net of tax and regulatory assets 22 20
Non-pension Benefit Plans | Regulatory | Assets    
Change in AOCI and Regulatory Assets    
Beginning Balance 29  
Amortized in current period 2  
Current year additions (reductions) (5)  
Change in FX rate 3  
Ending Balance 29 29
Non-pension Benefit Plans | Actuarial (gains) losses    
Change in AOCI and Regulatory Assets    
Beginning Balance (8)  
Amortized in current period 1  
Current year additions (reductions) (1)  
Change in FX rate 0  
Ending Balance (8) (8)
Non-pension Benefit Plans | Actuarial (gains) losses | Assets    
Change in AOCI and Regulatory Assets    
Amortized in current period 2  
Current year additions (reductions) 0  
Change in FX rate 0  
Non-pension Benefit Plans | Past service costs (gains)    
Change in AOCI and Regulatory Assets    
Beginning Balance (2)  
Amortized in current period (2)  
Current year additions (reductions) 0  
Change in FX rate 0  
Ending Balance $ 0 $ (2)