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Debt - Narrative (Detail)
CAD in Millions, $ in Millions
Dec. 31, 2017
CAD
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CAD
Dec. 31, 2016
USD ($)
Debt Disclosure [Abstract]        
Long-term debt and capital lease obligation current and non-current CAD 8,219 $ 5,755 CAD 8,749 $ 5,763
Annual maturities and principal repayments in 2018 742      
Annual maturities and principal repayments in 2019 462      
Annual maturities and principal repayments in 2020 63      
Annual maturities and principal repayments in 2021 353      
Annual maturities and principal repayments in 2022 CAD 466