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Intangible Assets - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]    
Amortization - intangible assets $ 153 $ 150
Amortization expense, next twelve months 97  
Amortization expense, year two 97  
Amortization expense, year three 97  
Amortization expense, year four 97  
Amortization expense, year five 97  
Land, transmission and water rights    
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]    
Cost not subject to amortization $ 123 $ 113