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Other long-term obligations - Additional Information (Detail) - CAD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Other long-term obligations [1] $ 3,943 $ 3,780
Environmental Obligations Noncurrent [Member]    
Other long-term obligations $ 65  
[1] Other long-term obligations included amounts to related parties of $38 million (2017 - $60 million).