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Investments (Changes In Allowance For Credit Losses On AFS) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |
Balance as of beginning-of-period | $ 19.0 |  |
Balance as of end-of-period | 22.0 | $ 19.0 |
Fixed Maturity AFS Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |
Balance as of beginning-of-period | 19.0 | 13.0 |
Additions for securities for which credit losses were not previously recognized | 8.0 | 9.0 | $ 45.0
Additions (reductions) for securities for which credit losses were previously recognized | 9.0 | 5.0 | (2.0)
Reductions for securities disposed | (2.0) | (2.0) | (17.0)
Reductions for securities charged-off | (12.0) | (6.0) | (13.0)
Balance as of end-of-period | 22.0 | 19.0 | 13.0
Accrued interest receivable on fixed maturity AFS securities | 1,100.0 | 972.0 | 1,000.0
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member] |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |
Balance as of beginning-of-period | 17.0 | 12.0 |
Additions for securities for which credit losses were not previously recognized | 4.0 | 8.0 | 43.0
Additions (reductions) for securities for which credit losses were previously recognized | 2.0 | 5.0 | (1.0)
Reductions for securities disposed | (2.0) | (2.0) | (17.0)
Reductions for securities charged-off | (12.0) | (6.0) | (13.0)
Balance as of end-of-period | 9.0 | 17.0 | 12.0
Fixed Maturity AFS Securities [Member] | RMBS [Member] |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |
Balance as of beginning-of-period | 1.0 | 1.0 |
Additions for securities for which credit losses were not previously recognized | 3.0 |  | 1.0
Additions (reductions) for securities for which credit losses were previously recognized | 3.0 |  |
Balance as of end-of-period | 7.0 | 1.0 | 1.0
Fixed Maturity AFS Securities [Member] | ABS [Member] |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |
Balance as of end-of-period | 5.0 |  |
Fixed Maturity AFS Securities [Member] | Other [Member] |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |
Balance as of beginning-of-period | 1.0 |  |
Additions for securities for which credit losses were not previously recognized | 1.0 | 1.0 | 1.0
Additions (reductions) for securities for which credit losses were previously recognized | 4.0 |  | $ (1.0)
Balance as of end-of-period | $ 6.0 | $ 1.0 |

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