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Investments (Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2025
USD ($)
securities
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
securities
Investment Narrative [Line Items]      
Securities As Percentage Of Consolidated Stockholder Equity 10.00%    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 100.00%   100.00%
Funds withheld at interest $ 5,328   $ 5,436
Funds Held Under Reinsurance Agreements Asset Specific Client $ 2,900    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities 6,260,000   6,401
Financing Receivable, before Allowance for Credit Loss $ 9,441   $ 8,952
Financing Receivable, Modified in Period, Amount 19 $ 21  
Financial Asset, Equal to or Greater than 90 Days Past Due      
Investment Narrative [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 6 $ 23  
CALIFORNIA      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 13.10%    
TEXAS      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 10.60%    
CANADA      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 6.50%    
UNITED KINGDOM      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 2.30%    
WASHINGTON      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 5.80%