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Other Liabilities and Provisions - Summary of Other Liabilities and Provisions (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other provisions [line items]    
Other liabilities and provisions CAD 1,977 CAD 1,322
Other Liabilities and Provisions [member]    
Disclosure of other provisions [line items]    
Provisions 1,905 1,236
Derivative liabilities (net of current portion of $nil (2016 - $5 million)) 43 21
Other 29 65
Other liabilities and provisions CAD 1,977 CAD 1,322