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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

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