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Financial Instruments - Carrying Amounts and Fair Values of Financial Instruments (Details) - Fixed rate long-term debt - Fixed interest rate - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities $ 13,259 $ 10,799
Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value $ 13,186 $ 10,795