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Risk Management - Additional Information (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
CAD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Disclosure of credit risk exposure [line items]          
Unencumbered assets $ 516,600   $ 470,200    
Percentage of equity hedges in the dynamic program offset against hedged variable annuity liability 95.00%   95.00% 95.00% 95.00%
Loaned securities included in invested assets $ 11,663   $ 10,136    
Reverse repurchase transactions recorded as short-term receivables 1,594   466    
Repurchase agreements and cash collateral on securities lent $ 668   202    
Term of credit default swaps 5 years 5 years      
Largest single counterparty exposure without master netting agreements or the benefit of collateral held $ 7,202   6,718    
Net amounts excluding financing entity $ 429   $ 154    
Percentage ceded to reinsurers 93.00%   91.00% 93.00% 91.00%
Exposure to credit risk $ 40,753   $ 22,264    
Net exposure after offsetting agreements and benefit of fair value of collateral held $ 17,595   17,984    
+10%          
Disclosure of credit risk exposure [line items]          
Percentage of expected changes in market values of publicly traded equities 10.00% 10.00%      
+20%          
Disclosure of credit risk exposure [line items]          
Percentage of expected changes in market values of publicly traded equities 20.00% 20.00%      
+30%          
Disclosure of credit risk exposure [line items]          
Percentage of expected changes in market values of publicly traded equities 30.00% 30.00%      
Reinsurance contracts held          
Disclosure of credit risk exposure [line items]          
Reinsurance assets $ 58,349   40,249    
Bottom of range          
Disclosure of credit risk exposure [line items]          
Global retention limit   $ 30      
Top of range          
Disclosure of credit risk exposure [line items]          
Global retention limit   $ 35      
Derivatives          
Disclosure of credit risk exposure [line items]          
Largest single counterparty exposure without master netting agreements or the benefit of collateral held 1,319   1,357    
Net amounts excluding financing entity $ 0   $ 0    
AA Credit Grades Or Higher          
Disclosure of credit risk exposure [line items]          
Derivative exposure with counterparties, percentage 30.00% 30.00% 33.00%    
Securities lending          
Disclosure of credit risk exposure [line items]          
Loaned securities included in invested assets $ 1,021   $ 626    
Largest single counterparty exposure without master netting agreements or the benefit of collateral held 0   0    
Net amounts excluding financing entity $ 0   0    
0.5% Decrease in Interest Rates          
Disclosure of credit risk exposure [line items]          
Sensitivity of net income attributed to shareholders 0.50% 0.50%      
Sensitivity of our net income attributed to shareholders due to change in interest rate $ 100        
0.5% Increase in Interest Rates          
Disclosure of credit risk exposure [line items]          
Sensitivity of net income attributed to shareholders 0.50% 0.50%      
Sensitivity of our net income attributed to shareholders due to change in interest rate $ 100        
0.5% Parallel Move in Interest Rates on CSM          
Disclosure of credit risk exposure [line items]          
Sensitivity of net income attributed to shareholders 0.50% 0.50%      
0.5% Parallel Move in Corporate Spread          
Disclosure of credit risk exposure [line items]          
Sensitivity of net income attributed to shareholders 0.50% 0.50%      
0.2% Percentage Parallel Move in Swap Spread          
Disclosure of credit risk exposure [line items]          
Sensitivity of net income attributed to shareholders 0.20% 0.20%      
Banks          
Disclosure of credit risk exposure [line items]          
Estimated maximum borrowing capacity       $ 500  
Unsecured revolving credit facility          
Disclosure of credit risk exposure [line items]          
Amounts outstanding $ 0   $ 0    
Unsecured revolving credit facility | Canadian Chartered Banks          
Disclosure of credit risk exposure [line items]          
Estimated maximum borrowing capacity $ 500        
Federal Home Loan Bank of Indianapolis          
Disclosure of credit risk exposure [line items]          
Estimated maximum borrowing capacity       3,800 $ 4,300
Amounts outstanding       $ 500 $ 500