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Investments (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Investment Narrative [Line Items]                  
Funds Held Under Reinsurance Agreements Asset Specific Client $ 4,700     $ 4,700          
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments $ 30   $ 46 $ 43 $ 54        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1,223     1,223   877      
Securities As Percentage Of Consolidated Stockholder Equity 10.00%     10.00%          
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 100.00%     100.00%   100.00%      
Funds withheld at interest $ 7,049     $ 7,049   $ 5,432      
Pre Tax Gains In Investment Related Gains Associated With Investments In Limited Partnerships       70          
Reclassification of Pre Tax Unrealized Gains From AOCI to Investment Income Associated With Limited Partnerships   $ 92              
Mortgage Loan Carrying Value Payout Adjusted Due To COVID-19 10     10   660      
Accounts Receivable, Allowance for Credit Loss 1     1   2      
Revision of Prior Period, Reclassification, Adjustment                  
Investment Narrative [Line Items]                  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest           102 $ (2) $ 1 $ 10
Fixed maturity securities                  
Investment Narrative [Line Items]                  
Financing Receivable, Allowance for Credit Loss 16     16   20      
Fixed maturity securities | Corporate Debt Securities [Member]                  
Investment Narrative [Line Items]                  
Financing Receivable, Allowance for Credit Loss $ 11     $ 11   $ 17      
CALIFORNIA                  
Investment Narrative [Line Items]                  
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 13.40%     13.40%          
TEXAS                  
Investment Narrative [Line Items]                  
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 13.50%     13.50%          
CANADA                  
Investment Narrative [Line Items]                  
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 3.20%     3.20%          
UNITED KINGDOM                  
Investment Narrative [Line Items]                  
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 1.80%     1.80%          
GEORGIA                  
Investment Narrative [Line Items]                  
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 8.10%     8.10%