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Long-Term Debt - Aggregate Maturities of Long-term Debt (Detail) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about borrowings [Line Items]    
Long-term debt $ 4,882 $ 6,164
Three to Five years [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Long-term debt 1,605  
Over 5 years [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Long-term debt $ 3,277 $ 6,164