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Risk Management - Additional Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Disclosure of Risk Management [line items]        
Loaned securities included in invested assets $ 10,136 $ 10,690    
Reverse repurchase transactions recorded as short-term receivables 466 895    
Repurchase transactions recorded as payables $ 202 895    
Term of credit default swaps 5 years      
Largest single counterparty exposure without master netting agreements or the benefit of collateral held $ 6,718 7,949    
Largest single counterparty exposure with master netting agreements or the benefit of collateral held $ 154 $ 215    
Percentage ceded to reinsurers 91.00% 91.00% 91.00% 91.00%
Exposure to credit risk $ 22,264 $ 25,247    
Net exposure after offsetting agreements and benefit of fair value of collateral held $ 17,984 $ 22,465    
Variable annuity guarantee liabilities, rebalanced basis point intervals 20.00%      
Percentage of equity hedges in the dynamic program offset against hedged variable annuity liability 95.00% 95.00% 95.00% 95.00%
Total unencumbered assets $ 470,200 $ 477,700    
FHLBI facility [Member]        
Disclosure of Risk Management [line items]        
Estimated maximum borrowing capacity     $ 4,300 $ 3,800
Amounts outstanding     500 $ 500
10% [member]        
Disclosure of Risk Management [line items]        
Percentage of expected changes in market values of publicly traded equities 10.00%      
20% [member]        
Disclosure of Risk Management [line items]        
Percentage of expected changes in market values of publicly traded equities 20.00%      
30% [member]        
Disclosure of Risk Management [line items]        
Percentage of expected changes in market values of publicly traded equities 30.00%      
50 basis point decrease in interest [member]        
Disclosure of Risk Management [line items]        
Sensitivity of our net income attributed to shareholders due to change in interest rate $ 100      
Sensitivity of net income attributed to shareholders 50.00%      
50 basis point increase in interest [member]        
Disclosure of Risk Management [line items]        
Sensitivity of our net income attributed to shareholders due to change in interest rate $ 100      
Sensitivity of net income attributed to shareholders 50.00%      
Reinsurance contracts held [Member]        
Disclosure of Risk Management [line items]        
Reinsurance assets $ 40,249 44,053    
U.S.banks [Member] | Unsecured revolving credit facility [Member]        
Disclosure of Risk Management [line items]        
Estimated maximum borrowing capacity     $ 500  
Amounts outstanding 0 0    
Canadian chartered banks [Member] | Unsecured revolving credit facility [Member]        
Disclosure of Risk Management [line items]        
Estimated maximum borrowing capacity 500      
Fixed Surplus Note [Member]        
Disclosure of Risk Management [line items]        
Net amounts of financial instruments presented in the Consolidated Statements of Financial Position 0 0    
Bottom of range [Member]        
Disclosure of Risk Management [line items]        
Global retention limit 30      
Top of range [Member]        
Disclosure of Risk Management [line items]        
Global retention limit   35    
Derivatives [Member]        
Disclosure of Risk Management [line items]        
Largest single counterparty exposure without master netting agreements or the benefit of collateral held 1,357 1,582    
Largest single counterparty exposure with master netting agreements or the benefit of collateral held $ 0 $ 0    
AA Credit Grades or Higher [Member]        
Disclosure of Risk Management [line items]        
Derivative exposure with counterparties, percentage 33.00% 36.00%    
Securities lending [Member]        
Disclosure of Risk Management [line items]        
Loaned securities included in invested assets $ 626 $ 723    
Largest single counterparty exposure without master netting agreements or the benefit of collateral held 0      
Largest single counterparty exposure with master netting agreements or the benefit of collateral held $ 0