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Investments (Changes In Allowance For Credit Losses On AFS) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]      
Balance as of beginning-of-period $ 22    
Balance as of end-of-period 39   $ 22
Accrued interest receivable on fixed maturity AFS securities 1,100   1,000
Corporate Bonds [Member]      
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]      
Balance as of beginning-of-period 9    
Balance as of end-of-period 27   9
RMBS [Member]      
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]      
Balance as of beginning-of-period 7    
Balance as of end-of-period 6   7
ABS [Member]      
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]      
Balance as of beginning-of-period 5    
Balance as of end-of-period 5   5
Fixed Maturity AFS Securities [Member]      
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]      
Balance as of beginning-of-period 22 $ 19 19
Additions for securities for which credit losses were not previously recognized 19 2  
Additions (reductions) for securities for which credit losses were previously recognized (1)    
Reductions for securities disposed (1) (1)  
Balance as of end-of-period 39 20 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 9 17 17
Additions for securities for which credit losses were not previously recognized 19    
Reductions for securities disposed (1) (1)  
Balance as of end-of-period 27 16 9
Fixed Maturity AFS Securities [Member] | RMBS [Member]      
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]      
Balance as of beginning-of-period 7 1 1
Additions for securities for which credit losses were not previously recognized   1  
Additions (reductions) for securities for which credit losses were previously recognized (1)    
Balance as of end-of-period 6 2 7
Fixed Maturity AFS Securities [Member] | Other [Member]      
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]      
Balance as of beginning-of-period 6 1 1
Additions for securities for which credit losses were not previously recognized   1  
Balance as of end-of-period $ 6 $ 2 $ 6