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Segregated Funds - Summary of Composition of Segregated Funds Net Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets $ 348,933 $ 400,196 $ 367,809
Composition of segregated funds net assets      
Held by policyholders 348,562 399,788  
Held by the Company 371 408  
Cash and short-term securities [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 4,280 3,955  
Debt securities [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 15,270 18,651  
Equity [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 15,499 16,844  
Mutual funds [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 308,707 354,882  
Other investments [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 4,293 4,613  
Accrued investment income [member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 1,680 2,340  
Other assets and liabilities, net [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets $ (796) $ (1,089)