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Investments (Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
securities
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
securities
Investment Narrative [Line Items]      
Accounts Receivable, Allowance for Credit Loss $ 1   $ 2
Document Period End Date Mar. 31, 2021    
Sales of fixed maturity securities available-for-sale $ 2,738 $ 2,141  
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash 5    
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments 13 8  
Available-for-sale Securities, Gross Realized Gains $ 167 27  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities 1,650,000   877
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 $ 5,459   $ 5,432
Funds Held Under Reinsurance Agreements Asset Specific Client 3,200    
Gain (Loss) on Sale of Equity Investments 3 $ (23)  
Mortgage Loan Carrying Value Payout Adjusted Due To COVID-19 $ 10   $ 660
CALIFORNIA      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 13.90%    
TEXAS      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 13.60%    
GEORGIA      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 8.80%    
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 1.80%