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Investments (Narrative) (Details)
$ in Millions
Mar. 31, 2022
USD ($)
securities
Dec. 31, 2021
USD ($)
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 $ 6,737 $ 6,954
Funds Held Under Reinsurance Agreements Asset Specific Client 4,400  
Financing Receivable, Troubled Debt Restructuring $ 77  
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities 4,136,000 1,862
CALIFORNIA    
Investment Narrative [Line Items]    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 12.70%  
TEXAS    
Investment Narrative [Line Items]    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 12.40%  
GEORGIA    
Investment Narrative [Line Items]    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 7.50%  
CANADA    
Investment Narrative [Line Items]    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 3.20%  
UNITED KINGDOM    
Investment Narrative [Line Items]    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 2.50%