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Long-Term Debt - Carrying Value of Long Term Debt Instruments (Detail)
CAD in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
CAD
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CAD
Disclosure of detailed information about borrowings [Line Items]      
Long-term debt CAD 4,785   CAD 5,696
4.70% Senior notes [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Issue date Jun. 23, 2016    
Maturity date Jun. 23, 2046    
Par value | $   $ 1,000  
Long-term debt CAD 1,246   1,333
5.375% Senior notes [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Issue date Mar. 04, 2016    
Maturity date Mar. 04, 2046    
Par value | $   750  
Long-term debt CAD 928   994
3.527% Senior notes [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Issue date Dec. 02, 2016    
Maturity date Dec. 02, 2026    
Par value | $   270  
Long-term debt CAD 338   361
4.150% Senior notes [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Issue date Mar. 04, 2016    
Maturity date Mar. 04, 2026    
Par value | $   1,000  
Long-term debt CAD 1,246   1,333
4.90% Senior notes [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Issue date Sep. 17, 2010    
Maturity date Sep. 17, 2020    
Par value | $   500  
Long-term debt CAD 626   669
7.768% Medium term notes [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Issue date Apr. 08, 2009    
Maturity date Apr. 08, 2019    
Par value | $   600  
Long-term debt     599
5.505% Medium term notes [member]      
Disclosure of detailed information about borrowings [Line Items]      
Issue date Jun. 26, 2008    
Maturity date Jun. 26, 2018    
Par value | $   $ 400  
Long-term debt CAD 400   400
Other notes payable [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Long-term debt CAD 1   CAD 7