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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

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