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Segments Disclosures - Additions to non-current assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [line items]      
PP&E $ 918 $ 480 $ 486
Intangible assets 31 9 14
Corporate      
Disclosure of operating segments [line items]      
PP&E 75 28 13
Intangible assets 9 8 13
Operating segments | Hydro      
Disclosure of operating segments [line items]      
PP&E 36 29 22
Intangible assets 0 0 0
Operating segments | Wind and Solar      
Disclosure of operating segments [line items]      
PP&E 745 166 174
Intangible assets 19 0 0
Operating segments | Gas      
Disclosure of operating segments [line items]      
PP&E 43 167 199
Intangible assets 0 0 0
Operating segments | Energy Transition      
Disclosure of operating segments [line items]      
PP&E 19 90 78
Intangible assets 0 1 1
Operating segments | Energy Marketing      
Disclosure of operating segments [line items]      
PP&E 0 0 0
Intangible assets $ 3 $ 0 $ 0