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Segments Disclosures - Selected Consolidated Statements of Financial Position Information (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]      
PP&E $ 5,714 $ 5,556 $ 5,320
Right-of-use assets 117 126 95
Intangible assets 223 252 $ 256
Goodwill 464 464  
Wind and Solar      
Disclosure of operating segments [line items]      
Goodwill 176 176  
Energy Marketing      
Disclosure of operating segments [line items]      
Goodwill 30 30  
Corporate      
Disclosure of operating segments [line items]      
PP&E 98 111  
Right-of-use assets 11 14  
Intangible assets 31 31  
Goodwill 0 0  
Operating segments | Hydro      
Disclosure of operating segments [line items]      
PP&E 462 437  
Right-of-use assets 7 6  
Intangible assets 2 2  
Goodwill 258 258  
Operating segments | Wind and Solar      
Disclosure of operating segments [line items]      
PP&E 3,360 2,837  
Right-of-use assets 94 98  
Intangible assets 141 157  
Goodwill 176 176  
Operating segments | Gas      
Disclosure of operating segments [line items]      
PP&E 1,543 1,858  
Right-of-use assets 5 6  
Intangible assets 40 49  
Goodwill 0 0  
Operating segments | Energy Transition      
Disclosure of operating segments [line items]      
PP&E 251 313  
Right-of-use assets 0 2  
Intangible assets 4 5  
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 8  
Goodwill $ 30 $ 30