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Debt - Narrative (Detail)
CAD in Millions, $ in Millions
Dec. 31, 2015
CAD
Dec. 31, 2015
USD ($)
Dec. 31, 2014
CAD
Dec. 31, 2014
USD ($)
Debt Disclosure [Abstract]        
Long-term debt and capital lease obligation current and non-current CAD 9,025 $ 5,788 CAD 5,793 $ 4,047
Annual maturities and principal repayments in 2016 26      
Annual maturities and principal repayments in 2017 29      
Annual maturities and principal repayments in 2018 778      
Annual maturities and principal repayments in 2019 508      
Annual maturities and principal repayments in 2020 CAD 68