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Segments Disclosures - Additions to non-current assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]      
PP&E $ 311 $ 875 $ 918
Intangible assets 10 13 31
Operating segments | Hydro      
Disclosure of operating segments [line items]      
PP&E 64 42 36
Intangible assets 0 0 0
Operating segments | Wind and Solar      
Disclosure of operating segments [line items]      
PP&E 97 674 745
Intangible assets 0 0 19
Operating segments | Gas      
Disclosure of operating segments [line items]      
PP&E 100 89 43
Intangible assets 0 0 0
Operating segments | Energy Transition      
Disclosure of operating segments [line items]      
PP&E 13 16 19
Intangible assets 0 0 0
Operating segments | Energy Marketing      
Disclosure of operating segments [line items]      
PP&E 0 0 0
Intangible assets 0 0 3
Operating segments | Corporate      
Disclosure of operating segments [line items]      
PP&E 37 54 75
Intangible assets $ 10 $ 13 $ 9