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Invested Assets and Investment Income - Summary of Invested Assets and Segregated Funds Net Assets, Measured at Fair Value (Detail) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value measurement of assets [Line Items]      
Debt securities $ 224,139 $ 218,724  
Public equities 28,067 23,722  
Real estate - investment property 13,233 12,832  
Other invested assets 35,306 30,195  
Segregated funds net assets 399,788 367,436  
Total assets 917,643 880,349  
FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Cash and short-term securities 2,214 2,079  
Debt securities 133,763 128,297  
Public equities 25,716 22,071  
AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Cash and short-term securities 14,339 18,314  
Debt securities 7,332 6,566  
Public equities 2,351 1,651  
Other cash and short-term securities [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Cash and short-term securities 6,041 5,774  
Real estate [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Real estate - investment property 11,421 10,982  
Other invested assets [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Other invested assets 24,300 19,149  
Canadian government and agency [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 22,670 25,215  
Canadian government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 18,706 20,667  
Canadian government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 3,964 4,548  
U.S. government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 12,607 11,449  
U.S. government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 18,792 19,787  
Other government and agency [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 24,759 24,345  
Other government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 21,888 19,732  
Other government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 2,871 4,613  
Residential mortgage asset-backed securities [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 8 9  
Residential mortgage asset-backed securities [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 1 1  
Commercial mortgage asset-backed securities [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 1,103 1,172  
Commercial mortgage asset-backed securities [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 79 93  
Other securitized assets [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 1,647 1,735  
Other securitized assets [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 58 55  
Financial assets at fair value, class [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Total assets 708,989 666,180  
Level 1 [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Segregated funds net assets 361,447 327,437  
Level 1 [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Public equities 25,716 22,071  
Level 1 [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Public equities 2,349 1,651  
Level 1 [Member] | Other cash and short-term securities [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Cash and short-term securities 6,041 5,774  
Level 1 [Member] | Other invested assets [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Other invested assets 257 100  
Level 1 [Member] | Financial assets at fair value, class [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Total assets 395,810 357,033  
Level 2 [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Segregated funds net assets 34,060 35,797  
Level 2 [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Cash and short-term securities 2,214 2,079  
Debt securities 133,723 127,787  
Level 2 [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Cash and short-term securities 14,339 18,314  
Debt securities 7,331 6,563  
Public equities 2    
Level 2 [Member] | Canadian government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 18,706 20,667  
Level 2 [Member] | Canadian government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 3,964 4,548  
Level 2 [Member] | U.S. government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 12,607 11,449  
Level 2 [Member] | U.S. government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 18,792 19,787  
Level 2 [Member] | Other government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 21,888 19,732  
Level 2 [Member] | Other government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 2,871 4,613  
Level 2 [Member] | Residential mortgage asset-backed securities [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 8 9  
Level 2 [Member] | Residential mortgage asset-backed securities [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 1 1  
Level 2 [Member] | Commercial mortgage asset-backed securities [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 1,103 1,172  
Level 2 [Member] | Commercial mortgage asset-backed securities [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 79 93  
Level 2 [Member] | Other securitized assets [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 1,619 1,690  
Level 2 [Member] | Other securitized assets [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 58 55  
Level 2 [Member] | Financial assets at fair value, class [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Total assets 273,365 274,356  
Level 3 [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Segregated funds net assets 4,281 4,202  
Total assets 41,915 38,234 $ 35,721
Level 3 [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 40 510  
Level 3 [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 1 3  
Level 3 [Member] | Real estate [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Real estate - investment property 11,421 10,982  
Total assets 35,533 30,589 29,753
Level 3 [Member] | Other invested assets [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Other invested assets 24,043 19,049  
Level 3 [Member] | Other invested assets [Member] | Real estate [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Total assets 24,043 19,049 $ 18,103
Level 3 [Member] | Other securitized assets [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 28 45  
Level 3 [Member] | Financial assets at fair value, class [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Total assets $ 39,814 $ 34,791