v3.26.1
Investments (Narrative) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2026
USD ($)
securities
Jun. 30, 2025
USD ($)
Dec. 31, 2025
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 $ 8,140   $ 8,149
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities 7,084,000   5,968
Financing Receivable, before Allowance for Credit Loss $ 12,097   $ 11,268
Financing Receivable, Modified in Period, Amount 45 $ 35  
Mortgage Loans in Process of Foreclosure, Amount $ 11    
CALIFORNIA      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 11.70%    
TEXAS      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 9.40%    
CANADA      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 5.90%    
UNITED KINGDOM      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 1.80%    
WASHINGTON      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 6.50%