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Segregated Funds - Summary of Composition of Segregated Funds Net Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets $ 400,196 $ 367,809 $ 343,477
Composition of segregated funds net assets      
Held by policyholders 399,788 367,436  
Held by the Company 408 373  
Cash and short-term securities [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 3,955 4,054  
Debt securities [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 18,651 17,913  
Equity [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 16,844 14,227  
Mutual funds [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 354,882 326,889  
Other investments [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 4,613 4,599  
Accrued investment income [member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 2,340 1,670  
Other assets and liabilities, net [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets $ (1,089) $ (1,543)