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Debt and Capital Structure - Schedule of Short-Term Borrowings (Details)
$ in Millions, $ in Millions
Sep. 30, 2025
CAD ($)
Dec. 31, 2024
CAD ($)
Dec. 31, 2024
USD ($)
Disclosure of detailed information about borrowings [line items]      
Short-Term Borrowings $ 0 $ 173  
WRB Uncommitted Demand Facilities      
Disclosure of detailed information about borrowings [line items]      
Short-Term Borrowings 0 173 $ 120
Uncommitted Demand Facility      
Disclosure of detailed information about borrowings [line items]      
Short-Term Borrowings $ 0 $ 0