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Interests in Structured Entities - Additional Information (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of unconsolidated structured entities [Line Items]      
Investment in startup capital of mutual funds CAD 1,918   CAD 1,903
Retail mutual fund assets under management 195,472   CAD 169,919
Hancock Victoria Plantations Holdings PTY Limited [Member]      
Disclosure of unconsolidated structured entities [Line Items]      
Consolidated timber assets CAD 884 CAD 920