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Investments, Allowance for Credit Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Investments [Abstract] |  |  |  |  |
Accrued interest receivables on available-for-sale fixed maturity securities | $ 387 | $ 390 | $ 387 | $ 390 | $ 371
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning balance | 45 | 51 | 40 | 0 |
Additions to allowance for securities for which credit losses were not previously recorded |  | 4 | 14 | 74 |
Additions to allowance for available-for-sale securities accounted for as PCD assets | 2 | 1 | 8 | 3 |
Reductions for securities sold during the period (realized) |  | 9 | 6 | 15 |
Write-offs charged against the allowance | 16 |  | 16 |  |
Reductions for intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis |  |  |  | 1 |
Additional increases or (decrease) to the allowance for credit losses on securities that had an allowance recorded in a previous period |  |  | (9) | (20) |
Total allowance for credit losses | 31 | 47 | 31 | 47 |
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASC 326 [Member] |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning balance |  |  |  | 6 |
Corporate and Other Bonds [Member] |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning balance | 24 | 39 | 23 | 0 |
Additions to allowance for securities for which credit losses were not previously recorded |  | 4 | 14 | 62 |
Additions to allowance for available-for-sale securities accounted for as PCD assets | 2 | 1 | 4 | 3 |
Reductions for securities sold during the period (realized) |  | 9 | 6 | 15 |
Write-offs charged against the allowance | 16 |  | 16 |  |
Reductions for intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis |  |  |  | 1 |
Additional increases or (decrease) to the allowance for credit losses on securities that had an allowance recorded in a previous period |  | (1) | (9) | (21) |
Total allowance for credit losses | 10 | 34 | 10 | 34 |
Corporate and Other Bonds [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | ASC 326 [Member] |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning balance |  |  |  | 6 |
Asset-Backed [Member] |  |  |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning balance | 21 | 12 | 17 | 0 |
Additions to allowance for securities for which credit losses were not previously recorded |  |  |  | 12 |
Additions to allowance for available-for-sale securities accounted for as PCD assets |  |  | 4 |  |
Additional increases or (decrease) to the allowance for credit losses on securities that had an allowance recorded in a previous period |  | 1 |  | 1 |
Total allowance for credit losses | $ 21 | $ 13 | $ 21 | $ 13 |

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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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