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Investments (Changes In Allowance For Credit Losses On AFS) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Balance as of beginning-of-period     $ 13  
Balance as of end-of-period $ 9   9  
Accrued interest receivable on fixed maturity AFS securities     1,000 $ 1,000
Fixed Maturity AFS Securities [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Balance as of beginning-of-period 14 $ 20 13  
Additions (reductions) for securities for which credit losses were previously recognized 1 19 2 39
Reductions for securities disposed   (17)   (17)
Reductions for securities charged-off (6)   (6)  
Balance as of end-of-period 9 22 9 22
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Balance as of beginning-of-period 13 20 12  
Additions (reductions) for securities for which credit losses were previously recognized 1 17 2 37
Reductions for securities disposed   (17)   (17)
Reductions for securities charged-off (6)   (6)  
Balance as of end-of-period 8 20 8 20
Fixed Maturity AFS Securities [Member] | RMBS [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Balance as of beginning-of-period 1   1  
Additions (reductions) for securities for which credit losses were previously recognized   1   1
Balance as of end-of-period $ 1 1 $ 1 1
Fixed Maturity AFS Securities [Member] | ABS [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Additions (reductions) for securities for which credit losses were previously recognized   1   1
Balance as of end-of-period   $ 1   $ 1