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Investments, Allowance for Credit Losses (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Investments [Abstract] |  |  |
Accrued interest receivables on available-for-sale fixed maturity securities | $ 389 | $ 390 | $ 371
Allowance for Credit Losses [Roll Forward] |  |  |
Beginning balance | 40 | 0 |
Additions to allowance for securities for which credit losses were not previously recorded | 14 | 48 |
Additions to allowance for available-for-sale securities accounted for as PCD assets | 2 | 1 |
Reductions for securities sold during the period (realized) | 6 | 5 |
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 decreases to the allowance for credit losses on securities that had an allowance recorded in a previous period | (7) |  |
Total allowance for credit losses | 43 | 49 |
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 | 23 | 0 |
Additions to allowance for securities for which credit losses were not previously recorded | 14 | 48 |
Additions to allowance for available-for-sale securities accounted for as PCD assets | 2 | 1 |
Reductions for securities sold during the period (realized) | 6 | 5 |
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 decreases to the allowance for credit losses on securities that had an allowance recorded in a previous period | (6) |  |
Total allowance for credit losses | 27 | 49 |
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 | 17 | 0 |
Additional decreases to the allowance for credit losses on securities that had an allowance recorded in a previous period | (1) |  |
Total allowance for credit losses | $ 16 | $ 0 |

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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=121582814&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=121582814&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=121645371&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=121558606&loc=SL82898722-210454 + Details
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