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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of fair value measurement of assets [Line Items]      
Debt securities $ 203,904 $ 224,139  
Public equities 23,519 28,067  
Real estate - investment property 13,272 13,233  
Other invested assets 42,783 35,306  
Segregated funds net assets 348,562 399,788  
Total assets 848,941 917,643  
FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Cash and short-term securities 1,933 2,214  
Debt securities 120,897 133,763  
Public equities 21,989 25,716  
AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Cash and short-term securities 10,926 14,339  
Debt securities 7,745 7,332  
Public equities 1,530 2,351  
Other cash and short-term securities [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Cash and short-term securities 6,294 6,041  
Real estate [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Real estate - investment property 11,394 11,421  
Other invested assets [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Other invested assets 30,256 24,300  
Canadian government and agency [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 21,266 22,670  
Canadian government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 14,798 18,706  
Canadian government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 6,468 3,964  
U.S. government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 9,440 12,607  
U.S. government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 14,384 18,792  
Other government and agency [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 26,473 24,759  
Other government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 22,986 21,888  
Other government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 3,487 2,871  
Residential mortgage asset-backed securities [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 7 8  
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 570 1,103  
Commercial mortgage asset-backed securities [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 24 79  
Other securitized assets [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 1,575 1,647  
Other securitized assets [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 111 58  
Financial assets at fair value, class [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Total assets 635,377 708,989  
Level 1 [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Segregated funds net assets 314,436 361,447  
Level 1 [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Public equities 21,918 25,716  
Level 1 [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Public equities 1,530 2,349  
Level 1 [Member] | Other cash and short-term securities [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Cash and short-term securities 6,294 6,041  
Level 1 [Member] | Other invested assets [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Other invested assets 26 257  
Level 1 [Member] | Financial assets at fair value, class [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Total assets 344,204 395,810  
Level 2 [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Segregated funds net assets 30,141 34,060  
Level 2 [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Cash and short-term securities 1,933 2,214  
Debt securities 120,865 133,723  
Level 2 [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Cash and short-term securities 10,926 14,339  
Debt securities 7,745 7,331  
Public equities   2  
Level 2 [Member] | Canadian government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 14,798 18,706  
Level 2 [Member] | Canadian government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 6,468 3,964  
Level 2 [Member] | U.S. government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 9,440 12,607  
Level 2 [Member] | U.S. government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 14,384 18,792  
Level 2 [Member] | Other government and agency [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 22,986 21,888  
Level 2 [Member] | Other government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 3,478 2,871  
Level 2 [Member] | Residential mortgage asset-backed securities [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 7 8  
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 570 1,103  
Level 2 [Member] | Commercial mortgage asset-backed securities [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 24 79  
Level 2 [Member] | Other securitized assets [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 1,549 1,619  
Level 2 [Member] | Other securitized assets [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 111 58  
Level 2 [Member] | Financial assets at fair value, class [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Total assets 245,426 273,365  
Level 3 [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Segregated funds net assets 3,985 4,281  
Total assets 42,575 41,915 $ 38,234
Level 3 [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 32 40  
Public equities 71    
Level 3 [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities   1  
Level 3 [Member] | Real estate [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Real estate - investment property 11,394 11,421  
Total assets 41,762 35,533 30,589
Level 3 [Member] | Other invested assets [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Other invested assets 30,230 24,043  
Level 3 [Member] | Other invested assets [Member] | Real estate [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Total assets 30,230 24,043 $ 19,049
Level 3 [Member] | Other government and agency [Member] | AFS [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 9    
Level 3 [Member] | Other securitized assets [Member] | FVTPL [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Debt securities 26 28  
Level 3 [Member] | Financial assets at fair value, class [Member]      
Disclosure of fair value measurement of assets [Line Items]      
Total assets $ 45,747 $ 39,814