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Long Term Debt - Aggregate Maturities of Long-Term Debt (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]    
Long-term debt $ 6,629 $ 6,071
Less than 1 year    
Disclosure of detailed information about borrowings [line items]    
Long-term debt 0 0
1 to 3 years    
Disclosure of detailed information about borrowings [line items]    
Long-term debt 2,829 1,672
3 to 5 years    
Disclosure of detailed information about borrowings [line items]    
Long-term debt 0 920
Over 5 years    
Disclosure of detailed information about borrowings [line items]    
Long-term debt $ 3,800 $ 3,479