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Segments Disclosures - Selected Consolidated Statements of Financial Position Information (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [line items]      
PP&E $ 5,556 $ 5,320 $ 5,822
Right-of-use assets 126 95 141
Intangible assets 252 256 $ 313
Goodwill 464 463  
Wind and Solar      
Disclosure of operating segments [line items]      
Goodwill 176 175  
Energy Marketing      
Disclosure of operating segments [line items]      
Goodwill 30 30  
Corporate      
Disclosure of operating segments [line items]      
PP&E 111 33  
Right-of-use assets 14 18  
Intangible assets 31 36  
Goodwill 0 0  
Operating segments | Hydro      
Disclosure of operating segments [line items]      
PP&E 437 466  
Right-of-use assets 6 5  
Intangible assets 2 3  
Goodwill 258 258  
Operating segments | Wind and Solar      
Disclosure of operating segments [line items]      
PP&E 2,837 2,304  
Right-of-use assets 98 64  
Intangible assets 157 147  
Goodwill 176 175  
Operating segments | Gas      
Disclosure of operating segments [line items]      
PP&E 1,858 2,036  
Right-of-use assets 6 7  
Intangible assets 49 56  
Goodwill 0 0  
Operating segments | Energy Transition      
Disclosure of operating segments [line items]      
PP&E 313 481  
Right-of-use assets 2 1  
Intangible assets 5 9  
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 8 5  
Goodwill $ 30 $ 30