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Segments Disclosures - Selected Consolidated Statements of Financial Position Information (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]      
PP&E $ 6,020 $ 5,714 $ 5,556
Right-of-use assets 120 117 126
Intangible assets 281 223 $ 252
Goodwill 517 464  
Wind and Solar      
Disclosure of operating segments [line items]      
Goodwill 178 176  
Gas      
Disclosure of operating segments [line items]      
Goodwill 51 0  
Energy Marketing      
Disclosure of operating segments [line items]      
Goodwill 30 30  
Operating segments | Hydro      
Disclosure of operating segments [line items]      
PP&E 501 462  
Right-of-use assets 7 7  
Intangible assets 3 2  
Goodwill 258 258  
Operating segments | Wind and Solar      
Disclosure of operating segments [line items]      
PP&E 3,428 3,360  
Right-of-use assets 96 94  
Intangible assets 133 141  
Goodwill 178 176  
Operating segments | Gas      
Disclosure of operating segments [line items]      
PP&E 1,805 1,543  
Right-of-use assets 6 5  
Intangible assets 108 40  
Goodwill 51 0  
Operating segments | Energy Transition      
Disclosure of operating segments [line items]      
PP&E 206 251  
Right-of-use assets 0 0  
Intangible assets 4 4  
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 3 5  
Goodwill 30 30  
Operating segments | Corporate      
Disclosure of operating segments [line items]      
PP&E 80 98  
Right-of-use assets 11 11  
Intangible assets 30 31  
Goodwill $ 0 $ 0