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Investments (Changes In Allowance For Credit Losses On Mortgage Loans On Real Estate) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Balance as of beginning-of-year     $ 204  
Balance as of end-of-year $ 170   170  
Changes in economic assumptions increasing provision (14) $ 112 34 $ 183
Accrued interest receivable excluded from credit losses 50 52 50 52
Unfunded Loan Commitment [Member]        
Balance as of beginning-of-year 184 161 204 2
Additions (reductions) from provision for credit loss expense (14) 112 (34) 183
Additions (reductions) for mortgage loans on real estate for which credit losses were previously recognized 1      
Balance as of end-of-year 170 273 170 273
Changes in economic assumptions increasing provision       1
Commercial [Member]        
Balance as of beginning-of-year     187  
Balance as of end-of-year 156   156  
Commercial [Member] | Unfunded Loan Commitment [Member]        
Balance as of beginning-of-year 172 126 187  
Additions (reductions) from provision for credit loss expense (16) 110 (31) 174
Balance as of end-of-year 156 236 156 236
Residential [Member]        
Balance as of beginning-of-year     17  
Balance as of end-of-year 14   14  
Residential [Member] | Unfunded Loan Commitment [Member]        
Balance as of beginning-of-year 12 35 17 2
Additions (reductions) from provision for credit loss expense 2 2 (3) 9
Balance as of end-of-year $ 14 $ 37 $ 14 37
Cumulative Effect, Period of Adoption, Adjustment [Member] | Unfunded Loan Commitment [Member]        
Balance as of beginning-of-year       88
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial [Member] | Unfunded Loan Commitment [Member]        
Balance as of beginning-of-year       62
Cumulative Effect, Period of Adoption, Adjustment [Member] | Residential [Member] | Unfunded Loan Commitment [Member]        
Balance as of beginning-of-year       $ 26