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Interests in Structured Entities - Schedule of Interests and Maximum Exposure to Loss From Significant Unconsolidated Financing Structured Entities (Detail) - Unconsolidated structured entities [Member] - Financing SEs [Member] - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of unconsolidated structured entities [Line Items]    
Company's interests $ 850 $ 931
Manulife Finance (Delaware), L.P.[Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Company's interests $ 850 $ 931