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Investments (Changes In Allowance For Credit Losses On AFS) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Balance as of beginning-of-period |  |  | $ 13 |
Balance as of end-of-period | $ 17 |  | 17 |
Accrued interest receivable on fixed maturity AFS securities |  |  | 1,100 | $ 1,100
Fixed Maturity AFS Securities [Member] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Balance as of beginning-of-period | 9 | $ 22 | 13 |
Additions for securities for which credit losses were not previously recognized | 8 | 5 | 8 | 44
Additions (reductions) for securities for which credit losses were previously recognized |  | (4) | 2 | (4)
Reductions for securities disposed |  |  |  | (17)
Reductions for securities charged-off |  | (11) | (6) | (11)
Balance as of end-of-period | 17 | 12 | 17 | 12
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 | 8 | 20 | 12 |
Additions for securities for which credit losses were not previously recognized | 8 | 5 | 8 | 42
Additions (reductions) for securities for which credit losses were previously recognized |  | (3) | 2 | (3)
Reductions for securities disposed |  |  |  | (17)
Reductions for securities charged-off |  | (11) | (6) | (11)
Balance as of end-of-period | 16 | 11 | 16 | 11
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 | 1 | 1 |
Additions for securities for which credit losses were not previously recognized |  |  |  | 1
Balance as of end-of-period | $ 1 | 1 | $ 1 | 1
Fixed Maturity AFS Securities [Member] | ABS [Member] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Balance as of beginning-of-period |  | 1 |  |
Additions for securities for which credit losses were not previously recognized |  |  |  | 1
Additions (reductions) for securities for which credit losses were previously recognized |  | $ (1) |  | $ (1)

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- Definition Amount of writeoff of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized by reversing interest income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 3D -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL120267862-210455 + Details
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