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Debt - Scheduled Principal Payments (Detail) - Dec. 31, 2018
$ in Millions, $ in Millions
CAD ($)
USD ($)
Disclosure of detailed information about borrowings [line items]    
Principal payments $ 5,227 $ 3,832
2020 [member]    
Disclosure of detailed information about borrowings [line items]    
Principal payments 31 23
2021 [member]    
Disclosure of detailed information about borrowings [line items]    
Principal payments 159 117
2022 [member]    
Disclosure of detailed information about borrowings [line items]    
Principal payments 275 202
2023 [member]    
Disclosure of detailed information about borrowings [line items]    
Principal payments 300 220
More Than 5 Years [member]    
Disclosure of detailed information about borrowings [line items]    
Principal payments $ 4,462 $ 3,270