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Debt - Scheduled Principal Payments (Detail) - Dec. 31, 2017
CAD in Millions, $ in Millions
CAD
USD ($)
Disclosure of detailed information about borrowings [line items]    
Principal payments CAD 6,105 $ 4,867
2018 [member]    
Disclosure of detailed information about borrowings [line items]    
Principal payments 28 22
2020 [member]    
Disclosure of detailed information about borrowings [line items]    
Principal payments 28 23
2021 [member]    
Disclosure of detailed information about borrowings [line items]    
Principal payments 275 220
2022 [member]    
Disclosure of detailed information about borrowings [line items]    
Principal payments 844 672
Thereafter [member]    
Disclosure of detailed information about borrowings [line items]    
Principal payments CAD 4,930 $ 3,930