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Intangible Assets - Schedule of Intangible Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Finite-Lived and Indefinite Lived Intangible Assets [Line Items]    
Cost $ 2,459 $ 2,301
Accumulated Amortization (798) (791)
Net Book Value 1,661 1,510
Land, transmission and water rights    
Finite-Lived and Indefinite Lived Intangible Assets [Line Items]    
Cost 1,188 1,071
Accumulated Amortization (210) (182)
Net Book Value 978 889
Assets under construction    
Finite-Lived and Indefinite Lived Intangible Assets [Line Items]    
Cost 93 58
Accumulated Amortization 0 0
Net Book Value 93 58
Computer software    
Finite-Lived and Indefinite Lived Intangible Assets [Line Items]    
Cost 1,035 1,040
Accumulated Amortization (493) (528)
Net Book Value 542 512
Other    
Finite-Lived and Indefinite Lived Intangible Assets [Line Items]    
Cost 143 132
Accumulated Amortization (95) (81)
Net Book Value $ 48 $ 51