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Long-Term Debt - Aggregate Maturities of Long-term Debt (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [Line Items]    
Long-term debt $ 4,769 $ 4,784
Less than 1 year [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Long-term debt   400
One to two years [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Long-term debt 681  
Two to three years [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Long-term debt   626
Over 5 years [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Long-term debt $ 4,088 $ 3,758