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Investments (Changes In Allowance For Credit Losses On Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Balance as of beginning-of-year |  |  | $ 204 |
Balance as of end-of-year | $ 170 |  | 170 |
Changes in economic assumptions increasing provision | (14) | $ 112 | 34 | $ 183
Accrued interest receivable excluded from credit losses | 50 | 52 | 50 | 52
Unfunded Loan Commitment [Member] |  |  |  |
Balance as of beginning-of-year | 184 | 161 | 204 | 2
Additions (reductions) from provision for credit loss expense | (14) | 112 | (34) | 183
Additions (reductions) for mortgage loans on real estate for which credit losses were previously recognized | 1 |  |  |
Balance as of end-of-year | 170 | 273 | 170 | 273
Changes in economic assumptions increasing provision |  |  |  | 1
Commercial [Member] |  |  |  |
Balance as of beginning-of-year |  |  | 187 |
Balance as of end-of-year | 156 |  | 156 |
Commercial [Member] | Unfunded Loan Commitment [Member] |  |  |  |
Balance as of beginning-of-year | 172 | 126 | 187 |
Additions (reductions) from provision for credit loss expense | (16) | 110 | (31) | 174
Balance as of end-of-year | 156 | 236 | 156 | 236
Residential [Member] |  |  |  |
Balance as of beginning-of-year |  |  | 17 |
Balance as of end-of-year | 14 |  | 14 |
Residential [Member] | Unfunded Loan Commitment [Member] |  |  |  |
Balance as of beginning-of-year | 12 | 35 | 17 | 2
Additions (reductions) from provision for credit loss expense | 2 | 2 | (3) | 9
Balance as of end-of-year | $ 14 | $ 37 | $ 14 | 37
Cumulative Effect, Period of Adoption, Adjustment [Member] | Unfunded Loan Commitment [Member] |  |  |  |
Balance as of beginning-of-year |  |  |  | 88
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial [Member] | Unfunded Loan Commitment [Member] |  |  |  |
Balance as of beginning-of-year |  |  |  | 62
Cumulative Effect, Period of Adoption, Adjustment [Member] | Residential [Member] | Unfunded Loan Commitment [Member] |  |  |  |
Balance as of beginning-of-year |  |  |  | $ 26

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