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Investments, Allowance for Credit Losses (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Investments [Abstract] |  |  |
Accrued interest receivables on available-for-sale fixed maturity securities |  | $ 390 |
Allowance for Credit Losses [Roll Forward] |  |  |
Balance as of December 31, 2019 |  | 0 |
Total allowance for credit losses | [1] | 49 |
ASU 2016-13 [Member] |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |
Balance as of December 31, 2019 |  | 6 |
Impact of adopting ASU 2016-13 |  |  | $ (5)
Corporate and Other Bonds [Member] |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |
Balance as of December 31, 2019 |  | 0 |
Additions to allowance for securities for which credit losses were not previously recorded |  | 48 |
Additions to allowance for available-for-sale securities accounted for as PCD assets |  | 1 |
Reductions for securities sold during the period (realized) |  | (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) |
Total allowance for credit losses | [1] | $ 49 |
Corporate and Other Bonds [Member] | ASU 2016-13 [Member] |  |  |
Allowance for Credit Losses [Roll Forward] |  |  |
Impact of adopting ASU 2016-13 |  |  | $ 6
[1] | On January 1, 2020, the Company adopted ASU 2016-13; see Note 1. The Unrealized OTTI Losses (Gains) column that tracked subsequent valuation changes on securities for which a credit loss had previously been recorded has been replaced with the Allowance for Credit Losses column. Prior period amounts were not adjusted for the adoption of this standard.

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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=118955579&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=118955579&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=118939692&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=118942338&loc=SL82898722-210454 + Details
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- Definition Amount of expense (reversal of expense) for 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), not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis, with previously recorded allowance. + 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 (f) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455 + Details
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