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Financial Instruments - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
CAD ($)
MW
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Apr. 05, 2022
MW
Disclosure of detailed information about financial instruments [line items]        
Financial liabilities $ 3,808 $ 3,466    
Long-term wind energy sale — Eastern U.S.        
Disclosure of detailed information about financial instruments [line items]        
Membership interest 100.00%      
Capacity of facility (in megawatts) | MW 90      
Long-term wind energy sale — Canada        
Disclosure of detailed information about financial instruments [line items]        
Membership interest 100.00%      
Garden Plain Wind Project        
Disclosure of detailed information about financial instruments [line items]        
Capacity of facility (in megawatts) | MW 130      
Weighted average extension period (in years) 17 years      
Long-term wind energy sale — Central U.S.        
Disclosure of detailed information about financial instruments [line items]        
Membership interest 100.00%      
White Rock East And White Rock West Wind Power Projects        
Disclosure of detailed information about financial instruments [line items]        
Capacity of facility (in megawatts) | MW 302      
Horizon Hill Wind Project        
Disclosure of detailed information about financial instruments [line items]        
Membership interest       100.00%
Capacity of facility (in megawatts) | MW       202
Level I | Recurring fair value measurement        
Disclosure of detailed information about financial instruments [line items]        
Commodity risk management assets and liabilities $ (12) (13)    
Level II | Recurring fair value measurement        
Disclosure of detailed information about financial instruments [line items]        
Commodity risk management assets and liabilities (2) (244)    
Level III | Recurring fair value measurement        
Disclosure of detailed information about financial instruments [line items]        
Commodity risk management assets and liabilities (153) (147) $ (782)  
Level III | Recurring fair value measurement | Other        
Disclosure of detailed information about financial instruments [line items]        
Commodity risk management assets and liabilities (4) 19    
Level III | Recurring fair value measurement | Other financial assets and liabilities (FVTPL)        
Disclosure of detailed information about financial instruments [line items]        
Financial liabilities 263 203    
Level III | Recurring fair value measurement | Other financial assets and liabilities (FVTPL)        
Disclosure of detailed information about financial instruments [line items]        
Loans receivable $ (110) $ 56