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Goodwill (Details)
 12 Months Ended
Dec. 31, 2023
CAD ($)
$ / MWh
Dec. 31, 2022
CAD ($)
$ / MWh
Disclosure of detailed information about intangible assets [line items]    
Goodwill $ 464,000,000 $ 464,000,000
Impairment of goodwill 0  
Hydro    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 258,000,000 258,000,000
Wind and Solar    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 176,000,000 176,000,000
Energy Marketing    
Disclosure of detailed information about intangible assets [line items]    
Goodwill $ 30,000,000 $ 30,000,000
Minimum    
Disclosure of detailed information about intangible assets [line items]    
Discount rate used to calculate goodwill impairment 5.90% 5.90%
Electricity prices | $ / MWh 20 28
Maximum    
Disclosure of detailed information about intangible assets [line items]    
Discount rate used to calculate goodwill impairment 8.20% 8.20%
Electricity prices | $ / MWh 238 233