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Investments (Changes In Allowance For Credit Losses On Mortgage Loans On Real Estate) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Balance as of beginning-of-year | $ 204,000,000 |  |
Balance as of end-of-year | 96,000,000 | $ 204,000,000 |
Changes in economic assumptions increasing provision | 108,000,000 |  |
Accrued interest receivable excluded from credit losses | 49,000,000 | 49,000,000 |
Financing Receivable, Credit Loss, Expense (Reversal) | (112,000,000) | 117,000,000 | $ 1,000,000
Unfunded Loan Commitment [Member] |  |  |
Balance as of beginning-of-year | 204,000,000 | 2,000,000 |
Additions (reductions) from provision for credit loss expense | (108,000,000) | 114,000,000 |
Additions (reductions) for mortgage loans on real estate for which credit losses were previously recognized | 4,000,000 |  |
Balance as of end-of-year | 96,000,000 | 204,000,000 | 2,000,000
Unfunded Loan Commitment [Member] | Covid 19 [Member] |  |  |
Financing Receivable, Credit Loss, Expense (Reversal) | 114,000,000 | (2,000,000) |
Commercial [Member] |  |  |
Balance as of beginning-of-year | 187,000,000 |  |
Balance as of end-of-year | 79,000,000 | 187,000,000 |
Commercial [Member] | Unfunded Loan Commitment [Member] |  |  |
Balance as of beginning-of-year | 187,000,000 |  |
Additions (reductions) from provision for credit loss expense | (108,000,000) | 125,000,000 |
Balance as of end-of-year | 79,000,000 | 187,000,000 |
Residential [Member] |  |  |
Balance as of beginning-of-year | 17,000,000 |  |
Balance as of end-of-year | 17,000,000 | 17,000,000 |
Residential [Member] | Unfunded Loan Commitment [Member] |  |  |
Balance as of beginning-of-year | 17,000,000 | 2,000,000 |
Additions (reductions) from provision for credit loss expense |  | (11,000,000) |
Balance as of end-of-year | $ 17,000,000 | 17,000,000 | 2,000,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Unfunded Loan Commitment [Member] |  |  |
Balance as of beginning-of-year |  | 88,000,000 |
Balance as of end-of-year |  |  | 88,000,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial [Member] | Unfunded Loan Commitment [Member] |  |  |
Balance as of beginning-of-year |  | 62,000,000 |
Balance as of end-of-year |  |  | 62,000,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Residential [Member] | Unfunded Loan Commitment [Member] |  |  |
Balance as of beginning-of-year |  | $ 26,000,000 |
Balance as of end-of-year |  |  | $ 26,000,000

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