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Financial Instruments - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
MW
Apr. 05, 2022
MW
Dec. 31, 2021
CAD ($)
MW
Dec. 31, 2020
CAD ($)
Disclosure of detailed information about financial instruments [line items]        
Financial liabilities $ 3,653   $ 3,267  
Decrease in base fair value (21)      
Increase in sensitivity values $ 9      
Other        
Disclosure of detailed information about financial instruments [line items]        
Commodity risk management assets and liabilities     $ 8  
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 – 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%      
Long-term wind energy sale - Central US        
Disclosure of detailed information about financial instruments [line items]        
Membership interest 100.00% 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]        
Capacity of facility (in megawatts) | MW   200    
Pembina | Long-term wind energy sale – Canada        
Disclosure of detailed information about financial instruments [line items]        
Membership interest     37.70%  
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 $ 23   $ 12  
Level II | Recurring fair value measurement        
Disclosure of detailed information about financial instruments [line items]        
Commodity risk management assets and liabilities 173   122  
Level III | Recurring fair value measurement        
Disclosure of detailed information about financial instruments [line items]        
Commodity risk management assets and liabilities (782)   159 $ 582
Level III | Recurring fair value measurement | Other        
Disclosure of detailed information about financial instruments [line items]        
Commodity risk management assets and liabilities (6)   8  
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 813   146  
Level III | Recurring fair value measurement | FVTPL        
Disclosure of detailed information about financial instruments [line items]        
Financial assets $ 31   $ 305