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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, 2023
Dec. 31, 2022
Jan. 01, 2022
Dec. 31, 2021
Disclosure of fair value measurement of assets [Line Items]        
Debt securities $ 212,149 $ 203,842 $ 224,139  
Private placements 45,606 42,010 47,289  
Mortgages 52,421 51,765 53,948  
Public equities 25,531 23,519 28,067  
Real estate 13,049 14,269 14,269  
Own use property   2,682    
Other invested assets 45,680 42,803 35,291  
Segregated funds net assets 377,544 348,562 399,788  
Total assets 875,574 833,689 $ 928,220  
FVOCI [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Cash and short-term securities 13,993 12,859    
Debt securities 127,190 126,371    
Private placements 44,952 41,494    
Mortgages 28,473 28,621    
FVTPL [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Cash and short-term securities 1      
Debt securities 2,372 2,209    
Private placements 654 516    
Mortgages 1,055 1,138    
Public equities 25,531 23,519    
Other cash and short-term securities [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Cash and short-term securities 6,343 6,294    
Other invested assets [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Other invested assets 33,653 31,095    
Canadian government and agency [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 20,988 21,266    
Canadian government and agency [Member] | FVOCI [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 19,769 20,279    
Canadian government and agency [Member] | FVTPL [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 1,219 987    
U.S. government and agency [Member] | FVOCI [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 26,287 22,446    
U.S. government and agency [Member] | FVTPL [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 1,303 1,378    
Other government and agency [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 30,666 26,473    
Other government and agency [Member] | FVOCI [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 30,576 26,314    
Other government and agency [Member] | FVTPL [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 90 159    
Residential mortgage asset-backed securities [Member] | FVOCI [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 6 7    
Commercial mortgage asset-backed securities [Member] | FVOCI [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 370 589    
Commercial mortgage asset-backed securities [Member] | FVTPL [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 1 6    
Other securitized assets [Member] | FVOCI [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 1,579 1,670    
Other securitized assets [Member] | FVTPL [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 15 16    
Investment property [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Real estate 10,458 11,417    
Own use property [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Own use property 2,430      
Financial assets at fair value, class [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Total assets 755,864 710,628    
Level 1 [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Public equities   23,448    
Segregated funds net assets 343,061 314,436    
Level 1 [Member] | FVTPL [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Public equities 25,423      
Level 1 [Member] | Other cash and short-term securities [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Cash and short-term securities 6,343 6,294    
Level 1 [Member] | Other invested assets [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Other invested assets 68 26    
Level 1 [Member] | Financial assets at fair value, class [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Total assets 374,895 344,204    
Level 2 [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Segregated funds net assets 30,991 30,141    
Level 2 [Member] | FVOCI [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Cash and short-term securities 13,993 12,859    
Debt securities 126,959 126,339    
Private placements 37,270 33,666    
Level 2 [Member] | FVTPL [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Cash and short-term securities 1      
Debt securities 2,372 2,209    
Private placements 575 485    
Public equities 67      
Level 2 [Member] | Canadian government and agency [Member] | FVOCI [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 19,769 20,279    
Level 2 [Member] | Canadian government and agency [Member] | FVTPL [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 1,219 987    
Level 2 [Member] | U.S. government and agency [Member] | FVOCI [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 26,287 22,446    
Level 2 [Member] | U.S. government and agency [Member] | FVTPL [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 1,303 1,378    
Level 2 [Member] | Other government and agency [Member] | FVOCI [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 30,566 26,305    
Level 2 [Member] | Other government and agency [Member] | FVTPL [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 90 159    
Level 2 [Member] | Residential mortgage asset-backed securities [Member] | FVOCI [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 6 7    
Level 2 [Member] | Commercial mortgage asset-backed securities [Member] | FVOCI [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 370 589    
Level 2 [Member] | Commercial mortgage asset-backed securities [Member] | FVTPL [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 1 6    
Level 2 [Member] | Other securitized assets [Member] | FVOCI [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 1,558 1,644    
Level 2 [Member] | Other securitized assets [Member] | FVTPL [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 15 16    
Level 2 [Member] | Financial assets at fair value, class [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Total assets 293,412 279,515    
Level 3 [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Public equities   71    
Segregated funds net assets 3,492 3,985    
Total assets 85,391 83,721   $ 83,606
Level 3 [Member] | FVOCI [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 231 32    
Private placements 7,682 7,828    
Mortgages 28,473 28,621    
Level 3 [Member] | FVTPL [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Private placements 79 31    
Mortgages 1,055 1,138    
Public equities 41      
Level 3 [Member] | Other invested assets [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Other invested assets 33,585 31,069    
Level 3 [Member] | Other government and agency [Member] | FVOCI [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 10 9    
Level 3 [Member] | Other securitized assets [Member] | FVOCI [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Debt securities 21 26    
Level 3 [Member] | Investment property [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Real estate 10,458 11,417    
Level 3 [Member] | Own use property [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Own use property 2,430      
Total assets 2,430 2,682    
Level 3 [Member] | Financial assets at fair value, class [Member]        
Disclosure of fair value measurement of assets [Line Items]        
Total assets $ 87,557 $ 86,909