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Segments Disclosures - Selected Consolidated Statements of Financial Position Information (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]      
PP&E $ 5,320 $ 5,822 $ 6,207
Right-of-use assets 95 141 146
Intangible assets 256 313 $ 318
Goodwill 463 463  
Wind and Solar      
Disclosure of operating segments [line items]      
Goodwill 175 175  
Energy Marketing      
Disclosure of operating segments [line items]      
Goodwill 30 30  
Corporate      
Disclosure of operating segments [line items]      
PP&E 33 16  
Right-of-use assets 18 22  
Intangible assets 36 41  
Goodwill 0 0  
Operating segments | Hydro      
Disclosure of operating segments [line items]      
PP&E 466 467  
Right-of-use assets 5 6  
Intangible assets 3 4  
Goodwill 258 258  
Operating segments | Wind and Solar      
Disclosure of operating segments [line items]      
PP&E 2,304 2,005  
Right-of-use assets 64 55  
Intangible assets 147 159  
Goodwill 175 175  
Operating segments | Gas      
Disclosure of operating segments [line items]      
PP&E 2,036 2,102  
Right-of-use assets 7 5  
Intangible assets 56 66  
Goodwill 0 0  
Operating segments | Energy Transition      
Disclosure of operating segments [line items]      
PP&E 481 1,232  
Right-of-use assets 1 53  
Intangible assets 9 36  
Goodwill 0 0  
Operating segments | Energy Marketing      
Disclosure of operating segments [line items]      
PP&E 0 0  
Right-of-use assets 0 0  
Intangible assets 5 7  
Goodwill $ 30 $ 30