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Investments, Allowance for Credit Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Investments [Abstract] |  |  |  |  |
Accrued interest receivables on available-for-sale fixed maturity securities | $ 374 | $ 373 | $ 374 | $ 373 | $ 371
Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning balance | 43 | 49 | 40 | 0 |
Additions to allowance for securities for which credit losses were not previously recorded |  | 22 | 14 | 70 |
Additions to allowance for available-for-sale securities accounted for as PCD assets | 4 | 1 | 6 | 2 |
Reductions for securities sold during the period (realized) |  | 1 | 6 | 6 |
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 | (2) | (20) | (9) | (20) |
Total allowance for credit losses | 45 | 51 | 45 | 51 |
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 | 27 | 49 | 23 | 0 |
Additions to allowance for securities for which credit losses were not previously recorded |  | 10 | 14 | 58 |
Additions to allowance for available-for-sale securities accounted for as PCD assets |  | 1 | 2 | 2 |
Reductions for securities sold during the period (realized) |  | 1 | 6 | 6 |
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 | (3) | (20) | (9) | (20) |
Total allowance for credit losses | 24 | 39 | 24 | 39 |
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 | 16 | 0 | 17 | 0 |
Additions to allowance for securities for which credit losses were not previously recorded |  | 12 |  | 12 |
Additions to allowance for available-for-sale securities accounted for as PCD assets | 4 |  | 4 |  |
Additional increases or (decrease) to the allowance for credit losses on securities that had an allowance recorded in a previous period | 1 |  |  |  |
Total allowance for credit losses | $ 21 | $ 12 | $ 21 | $ 12 |

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