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Investments (Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2024
USD ($)
securities
Mar. 31, 2023
USD ($)
Dec. 31, 2023
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 $ 5,642   $ 5,683
Funds Held Under Reinsurance Agreements Asset Specific Client $ 3,300    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities 6,101,000   5,788
Financing Receivable, before Allowance for Credit Loss $ 7,633   $ 7,459
Real Estate Owned, Transfer to Real Estate Owned 21 $ 17  
Financial Asset, Equal to or Greater than 90 Days Past Due      
Investment Narrative [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 23 $ 19  
CALIFORNIA      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 14.00%    
TEXAS      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 10.40%    
CANADA      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 4.00%    
UNITED KINGDOM      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 2.40%    
WASHINGTON      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 7.30%