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Investments in Available-for-sale Fixed Maturity Securities - Allowance for Credit Loss for Available-for-Sale Fixed Maturity Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | $ (28) | $ (22) | $ (24) | $ (29)
Acquisition from business combination | 0 | 0 | 0 | 0
Credit losses recognized on securities for which credit losses were not previously recorded | (13) | (19) | (33) | (25)
Reductions for securities sold during the period | 0 | 1 | 1 | 2
Allowance on securities that had an allowance recorded in a previous period | 4 | 8 | 18 | 20
Ending balance | (37) | (32) | (37) | (32)
Corporate debt securities |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | (24) | (12) | (19) | (24)
Acquisition from business combination | 0 | 0 | 0 | 0
Credit losses recognized on securities for which credit losses were not previously recorded | (13) | (17) | (33) | (18)
Reductions for securities sold during the period | 0 | 1 | 1 | 2
Allowance on securities that had an allowance recorded in a previous period | 3 | 6 | 17 | 18
Ending balance | (34) | (22) | (34) | (22)
Residential mortgage-backed securities |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | (1) | 0 | (1) | 0
Acquisition from business combination | 0 | 0 | 0 | 0
Credit losses recognized on securities for which credit losses were not previously recorded | 0 | (1) | 0 | (1)
Reductions for securities sold during the period | 0 | 0 | 0 | 0
Allowance on securities that had an allowance recorded in a previous period | 0 | 0 | 0 | 0
Ending balance | (1) | (1) | (1) | (1)
Commercial mortgage-backed securities |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 0 | 0 | 0 | 0
Acquisition from business combination | 0 | 0 | 0 | 0
Credit losses recognized on securities for which credit losses were not previously recorded | 0 | 0 | 0 | 0
Reductions for securities sold during the period | 0 | 0 | 0 | 0
Allowance on securities that had an allowance recorded in a previous period | 0 | 0 | 0 | 0
Ending balance | 0 | 0 | 0 | 0
Collateralized debt securities |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | (3) | (10) | (4) | (5)
Acquisition from business combination | 0 | 0 | 0 | 0
Credit losses recognized on securities for which credit losses were not previously recorded | 0 | (1) | 0 | (6)
Reductions for securities sold during the period | 0 | 0 | 0 | 0
Allowance on securities that had an allowance recorded in a previous period | 1 | 2 | 1 | 2
Ending balance | $ (2) | $ (9) | $ (2) | $ (9)

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- Definition Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Acquisition From Business Combination + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount excluding accrued interest, 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 -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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- Definition Amount, excluding accrued interest, of credit loss expense on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with no credit loss previously recorded. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with previously recorded allowance and not intended to be sold and not 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 -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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- Definition Amount, excluding accrued interest, 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 -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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