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Financial Instruments - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
MW
Dec. 31, 2022
CAD ($)
MW
Apr. 05, 2022
MW
Dec. 31, 2021
CAD ($)
Disclosure of detailed information about financial instruments [line items]        
Financial liabilities $ 3,466 $ 3,653    
Long-term wind energy sale – Eastern US        
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 US        
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   300    
Horizon Hill Wind Project        
Disclosure of detailed information about financial instruments [line items]        
Membership interest     10000.00%  
Capacity of facility (in megawatts) | MW     200  
Maximum | Fixed-price contracts        
Disclosure of detailed information about financial instruments [line items]        
Capacity long-term fixed price power sale | MW 380      
Minimum | Fixed-price contracts        
Disclosure of detailed information about financial instruments [line items]        
Capacity long-term fixed price power sale | MW 300      
Level I | Recurring fair value measurement        
Disclosure of detailed information about financial instruments [line items]        
Commodity risk management assets and liabilities $ (13) $ 23    
Level II | Recurring fair value measurement        
Disclosure of detailed information about financial instruments [line items]        
Commodity risk management assets and liabilities (244) 173    
Level III | Recurring fair value measurement        
Disclosure of detailed information about financial instruments [line items]        
Commodity risk management assets and liabilities (147) (782)   $ 159
Level III | Recurring fair value measurement | Other        
Disclosure of detailed information about financial instruments [line items]        
Commodity risk management assets and liabilities 19 6    
Level III | Recurring fair value measurement | Financial liabilities at fair value through profit or loss, category        
Disclosure of detailed information about financial instruments [line items]        
Financial liabilities 203 813    
Level III | Recurring fair value measurement | Other financial assets (FVTPL)        
Disclosure of detailed information about financial instruments [line items]        
Financial assets $ 56 $ 31