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Interests in Structured Entities - Additional Information (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of unconsolidated structured entities [Line Items]    
Investment in startup capital of mutual funds $ 1,711 $ 1,918
Retail mutual fund assets under management 182,219 191,507
Hancock Victoria Plantations Holdings PTY Limited [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Consolidated timber assets $ 920 $ 884