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Goodwill (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
CAD ($)
cADPerMegawattHour
Dec. 31, 2020
CAD ($)
cADPerMegawattHour
Disclosure of detailed information about intangible assets [line items]    
Goodwill $ 463 $ 463
Hydro generation    
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 175 175
Energy Marketing    
Disclosure of detailed information about intangible assets [line items]    
Goodwill $ 30 $ 30
Minimum    
Disclosure of detailed information about intangible assets [line items]    
Electricity prices | cADPerMegawattHour 17 6
Discount rate used to calculate goodwill impairment 5.00% 4.80%
Maximum    
Disclosure of detailed information about intangible assets [line items]    
Electricity prices | cADPerMegawattHour 136 160
Discount rate used to calculate goodwill impairment 6.40% 6.30%