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Interests in Structured Entities - Additional Information (Detail) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of unconsolidated structured entities [Line Items]    
Investment in startup capital of mutual funds $ 0 $ 1,576
Retail mutual fund assets under management 238,068 217,015
MFCT II Senior Debenture [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Outstanding of Principal Amount for Debenture notes 1,000  
Hancock Victoria Plantations Holdings PTY Limited [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Consolidated timber assets $ 0 $ 936