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Debt and Capital Structure - Schedule of Long-Term Debt (Detail) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]    
Debt Premiums (Discounts), Net, and Transaction Costs $ 64 $ 80
Long-Term Debt 7,534 7,108
Less: Current Portion 192 0
Long-Term Debt 7,342 7,108
Long-Term Debt    
Disclosure of detailed information about borrowings [line items]    
Total Debt Principal, (CAD equivalent) 7,470 7,028
Long-Term Debt | Revolving Term Debt    
Disclosure of detailed information about borrowings [line items]    
Committed Credit Facility 0 0
Long-Term Debt | U.S. Dollar Denominated Unsecured Notes    
Disclosure of detailed information about borrowings [line items]    
Total Debt Principal, (CAD equivalent) 5,470 5,028
Long-Term Debt | Canadian Dollar Unsecured Notes    
Disclosure of detailed information about borrowings [line items]    
Total Debt Principal, (CAD equivalent) $ 2,000 $ 2,000