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Goodwill (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
cADPerMegawattHour
Dec. 31, 2021
CAD ($)
cADPerMegawattHour
Disclosure of detailed information about intangible assets [line items]    
Goodwill $ 464 $ 463
Impairment of goodwill 0  
Hydro    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 258 258
Wind and Solar    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 176 175
Energy Marketing    
Disclosure of detailed information about intangible assets [line items]    
Goodwill $ 30 $ 30
Minimum    
Disclosure of detailed information about intangible assets [line items]    
Discount rate used to calculate goodwill impairment 5.90% 5.00%
Electricity prices | cADPerMegawattHour 28 17
Maximum    
Disclosure of detailed information about intangible assets [line items]    
Discount rate used to calculate goodwill impairment 8.20% 6.40%
Electricity prices | cADPerMegawattHour 233 136