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Debt - Narrative (Detail)
$ in Millions, $ in Millions
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]        
Long-term debt and capital lease obligation current and non-current $ 8,757 $ 5,970 $ 8,219 $ 5,755
Annual maturities and principal repayments in 2019 501      
Annual maturities and principal repayments in 2020 67      
Annual maturities and principal repayments in 2021 382      
Annual maturities and principal repayments in 2022 494      
Annual maturities and principal repayments in 2023 $ 507