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Debt - Components of Long-term Debt - J (Narrative) (Detail)
CAD in Millions, $ in Millions
12 Months Ended
Dec. 31, 2015
CAD
Dec. 31, 2015
USD ($)
Dec. 31, 2014
CAD
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]        
Long-term debt | CAD CAD 8,927   CAD 5,625  
Weighted-average interest rate on borrowings 0.44% 0.44%    
Debt Instrument maturity date less than 90 days      
Commercial Paper [Member]        
Debt Instrument [Line Items]        
Proceeds from issuance of commercial paper   $ 1,000    
Line of credit facility   $ 1,000    
Credit facility maturity date Sep. 23, 2017      
Long-term debt     CAD 783 $ 675