XML 151 R122.htm IDEA: XBRL DOCUMENT v3.8.0.1
Long-Term Debt - Aggregate Maturities of Long-term Debt (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [Line Items]    
Long-term debt CAD 4,785 CAD 5,696
Less than 1 year [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Long-term debt 401 7
One to two years [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Long-term debt   400
Two to three years [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Long-term debt 626 599
Three to four years [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Long-term debt   669
Over 5 years [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Long-term debt CAD 3,758 CAD 4,021