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Segregated Funds - Summary of Composition of Segregated Funds Net Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets $ 367,809 $ 343,477 $ 313,596
Composition of segregated funds net assets      
Held by policyholders 367,436 343,108  
Held by the Company 373 369  
Cash and short-term securities [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 4,054 3,364  
Debt securities [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 17,913 16,883  
Equity [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 14,227 12,989  
Mutual funds [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 326,889 304,753  
Other investments [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 4,599 4,785  
Accrued investment income [member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets 1,670 1,678  
Other assets and liabilities, net [Member]      
Disclosure of Composition Of Segregated Fund [line items]      
Total segregated funds net assets $ (1,543) $ (975)