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Investments - Changes in Allowance for Credit Losses on AFS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of beginning-of-year | $ 19 | $ 22 | $ 19
Additions from purchases of PCD debt securities | 0 | 0 | 0
Additions for securities for which credit losses were not previously recognized | 25 | 26 | 8
Additions (reductions) for securities for which credit losses were previously recognized | 17 | (5) | 9
Reductions for securities disposed |  | (2) | (2)
Reductions for securities charged off | (15) | (22) | (12)
Balance as of end-of-period | 46 | 19 | 22
Accrued interest receivable on fixed maturity AFS securities | 876 | 908 | 1,100
Corporate bonds |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of beginning-of-year | 8 | 9 | 17
Additions from purchases of PCD debt securities | 0 | 0 | 0
Additions for securities for which credit losses were not previously recognized | 10 | 25 | 4
Additions (reductions) for securities for which credit losses were previously recognized | 11 | (2) | 2
Reductions for securities disposed |  | (2) | (2)
Reductions for securities charged off | (15) | (22) | (12)
Balance as of end-of-period | 14 | 8 | 9
RMBS |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of beginning-of-year | 6 | 7 | 1
Additions from purchases of PCD debt securities | 0 | 0 | 0
Additions for securities for which credit losses were not previously recognized | 0 | 1 | 3
Additions (reductions) for securities for which credit losses were previously recognized | 1 | (2) | 3
Reductions for securities disposed |  | 0 | 0
Reductions for securities charged off | 0 | 0 | 0
Balance as of end-of-period | 7 | 6 | 7
ABS |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of beginning-of-year | 4 | 5 | 1
Additions from purchases of PCD debt securities | 0 | 0 | 0
Additions for securities for which credit losses were not previously recognized | 15 | 0 | 0
Additions (reductions) for securities for which credit losses were previously recognized | 5 | (1) | 4
Reductions for securities disposed |  | 0 | 0
Reductions for securities charged off | 0 | 0 | 0
Balance as of end-of-period | 24 | 4 | 5
Hybrids |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of beginning-of-year | 1 | 1 | 0
Additions from purchases of PCD debt securities | 0 | 0 | 0
Additions for securities for which credit losses were not previously recognized | 0 | 0 | 1
Additions (reductions) for securities for which credit losses were previously recognized | 0 | 0 | 0
Reductions for securities disposed |  | 0 | 0
Reductions for securities charged off | 0 | 0 | 0
Balance as of end-of-period | $ 1 | $ 1 | $ 1

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- Definition Amount of writeoff of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized by reversing interest income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3D -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-3D + 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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