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Segments Disclosures - Additions to non-current assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]      
PP&E $ 875 $ 918 $ 480
Intangible assets 13 31 9
Corporate      
Disclosure of operating segments [line items]      
PP&E 54 75 28
Intangible assets 13 9 8
Operating segments | Hydro      
Disclosure of operating segments [line items]      
PP&E 42 36 29
Intangible assets 0 0 0
Operating segments | Wind and Solar      
Disclosure of operating segments [line items]      
PP&E 674 745 166
Intangible assets 0 19 0
Operating segments | Gas      
Disclosure of operating segments [line items]      
PP&E 89 43 167
Intangible assets 0 0 0
Operating segments | Energy Transition      
Disclosure of operating segments [line items]      
PP&E 16 19 90
Intangible assets 0 0 1
Operating segments | Energy Marketing      
Disclosure of operating segments [line items]      
PP&E 0 0 0
Intangible assets $ 0 $ 3 $ 0