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Investments - Investments - ACL on Fixed Maturities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance | $ (32) |  | $ 0 |
Credit losses on fixed maturities where credit losses were not previously recorded | 3 |  | 38 |
Reduction due to sales | (1) |  | (3) |
Reduction due to intent to sell | 0 | $ 0 | (5) | $ 0
Net increases (decreases) in allowance on fixed maturities that had an allowance in a previous period | (2) |  | (3) |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance | (32) |  | (32) |
Corporate |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance | (32) |  | 0 |
Credit losses on fixed maturities where credit losses were not previously recorded | 0 |  | 35 |
Reduction due to sales | (1) |  | (3) |
Net increases (decreases) in allowance on fixed maturities that had an allowance in a previous period | (2) |  | (3) |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance | (29) |  | (29) |
Municipal |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance | 0 |  | 0 |
Credit losses on fixed maturities where credit losses were not previously recorded | 3 |  | 3 |
Reduction due to sales | 0 |  | 0 |
Net increases (decreases) in allowance on fixed maturities that had an allowance in a previous period | 0 |  | 0 |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance | $ (3) |  | $ (3) |

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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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- Definition Amount of expense 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), for which no credit loss was previously recorded. + 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 (b) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 + 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=121582814&loc=SL82922900-210455 + Details
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- Definition Amount of decrease in 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) from 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 (d) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 + Details
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- Definition Amount of decrease in 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) from intent to sell or more likely than not will be required to sell before recovery of amortized cost basis. + 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 (e) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 + Details
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