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Long-Term Debt - Aggregate Maturities of Long-term Debt (Detail) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Jan. 01, 2022
Disclosure of detailed information about borrowings [Line Items]      
Long-term debt $ 6,071 $ 6,234 $ 4,882
Less than 1 year [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Long-term debt 0 0  
One to three years [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Long-term debt 1,672 0  
Three to Five years [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Long-term debt 920 2,661  
Over 5 years [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Long-term debt $ 3,479 $ 3,573