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Investments (Narrative) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2023
USD ($)
securities
Dec. 31, 2022
USD ($)
securities
Jun. 30, 2022
USD ($)
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 $ 5,862 $ 6,003  
Funds Held Under Reinsurance Agreements Asset Specific Client $ 3,600    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities 6,456,000 6,441  
Financing Receivable, before Allowance for Credit Loss $ 7,109 $ 6,653  
Real Estate Owned, Transfer to Real Estate Owned 17    
Financing Receivable, Troubled Debt Restructuring   $ 77  
Mortgage Loans in Process of Foreclosure, Amount     $ 36
Accounts Receivable, Noncurrent, Nonaccrual $ 7    
CALIFORNIA      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 13.30%    
TEXAS      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 11.80%    
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 2.30%    
WASHINGTON      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 8.10%