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Debt - Narrative (Detail)
CAD in Millions, $ in Millions
Dec. 31, 2016
CAD
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CAD
Dec. 31, 2015
USD ($)
Debt Disclosure [Abstract]        
Long-term debt and capital lease obligation current and non-current CAD 8,749 $ 5,763 CAD 9,025 $ 5,788
Annual maturities and principal repayments in 2017 21      
Annual maturities and principal repayments in 2018 766      
Annual maturities and principal repayments in 2019 493      
Annual maturities and principal repayments in 2020 66      
Annual maturities and principal repayments in 2021 CAD 377