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Investments (Changes In Allowance For Credit Losses On Mortgage Loans On Real Estate) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Balance as of beginning-of-year $ 96 $ 204
Additions (reductions) from provision for credit loss expense (19) (20)
Balance as of end-of-year 77 184
Accrued interest receivable excluded from credit losses 49 51
Improving Economic Projections [Member]    
Financing Receivable, Credit Loss, Expense (Reversal) (19) 20
Unfunded Loan Commitment [Member]    
Financing Receivable, Credit Loss, Expense (Reversal) (1) 4
Commercial [Member]    
Balance as of beginning-of-year 79 187
Additions (reductions) from provision for credit loss expense (20) (15)
Balance as of end-of-year 59 172
Residential [Member]    
Balance as of beginning-of-year 17 17
Additions (reductions) from provision for credit loss expense 1 (5)
Balance as of end-of-year $ 18 $ 12