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Investments (Changes In Allowance For Credit Losses On Mortgage Loans On Real Estate) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Balance as of beginning-of-year $ 170,000,000 $ 273,000,000 $ 204,000,000 $ 2,000,000
Additions (reductions) from provision for credit loss expense (39,000,000) (71,000,000) (73,000,000) 112,000,000
Balance as of end-of-year 131,000,000 202,000,000 131,000,000 202,000,000
Changes in economic assumptions increasing provision (39,000,000)   (73,000,000)  
Accrued interest receivable excluded from credit losses 50,000,000   50,000,000  
Covid 19 [Member]        
Financing Receivable, Credit Loss, Expense (Reversal)   71,000,000   112,000,000
Unfunded Loan Commitment [Member]        
Additions (reductions) for mortgage loans on real estate for which credit losses were previously recognized 1,000,000   4,000,000  
Financing Receivable, Credit Loss, Expense (Reversal)   0   1,000,000
Commercial [Member]        
Balance as of beginning-of-year 156,000,000 236,000,000 187,000,000  
Additions (reductions) from provision for credit loss expense (41,000,000) (64,000,000) (72,000,000) 110,000,000
Balance as of end-of-year 115,000,000 172,000,000 115,000,000 172,000,000
Residential [Member]        
Balance as of beginning-of-year 14,000,000 37,000,000 17,000,000 2,000,000
Additions (reductions) from provision for credit loss expense 2,000,000 (7,000,000) (1,000,000) 2,000,000
Balance as of end-of-year $ 16,000,000 $ 30,000,000 $ 16,000,000 30,000,000
Cumulative Effect, Period of Adoption, Adjustment [Member]        
Balance as of beginning-of-year       88,000,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial [Member]        
Balance as of beginning-of-year       62,000,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Residential [Member]        
Balance as of beginning-of-year       $ 26,000,000