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Goodwill (Details)
 12 Months Ended
Dec. 31, 2024
CAD ($)
$ / MWh
Dec. 31, 2023
CAD ($)
$ / MWh
Disclosure of detailed information about intangible assets [line items]    
Total goodwill $ 517,000,000 $ 464,000,000
Impairment of goodwill $ 0  
Wind and Solar | Merchant Discount Rate    
Disclosure of detailed information about intangible assets [line items]    
Discount rate 0.50%  
Minimum    
Disclosure of detailed information about intangible assets [line items]    
Electricity prices (in CAD per Mwh) | $ / MWh 40 35
Discount rate 6.40% 6.40%
Maximum    
Disclosure of detailed information about intangible assets [line items]    
Electricity prices (in CAD per Mwh) | $ / MWh 225 238
Discount rate 7.30% 7.50%
Hydro generation    
Disclosure of detailed information about intangible assets [line items]    
Total goodwill $ 258,000,000 $ 258,000,000
Wind and Solar    
Disclosure of detailed information about intangible assets [line items]    
Total goodwill 178,000,000 176,000,000
Gas    
Disclosure of detailed information about intangible assets [line items]    
Total goodwill 51,000,000 0
Energy Marketing    
Disclosure of detailed information about intangible assets [line items]    
Total goodwill $ 30,000,000 $ 30,000,000