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Investments - Changes in Allowance for Credit Losses on AFS (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance as of beginning-of-period | $ 39 | $ 25 | $ 19 | $ 22
Additions from purchases of PCD debt securities | 0 | 0 | 0 | 0
Additions for securities for which credit losses were not previously recognized | 7 | 1 | 23 | 21
Additions (reductions) for securities for which credit losses were previously recognized | 8 | 0 | 17 | (3)
Reductions for disposed securities | (1) |  | 0 | (1)
Reductions for securities charged-off | (5) | (5) | (11) | (18)
Balance as of end-of-period | 48 | 21 | 48 | 21
Accrued interest receivable on fixed maturity AFS securities |  |  | 927 | 1,200
Corporate bonds |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance as of beginning-of-period | 13 | 13 | 8 | 9
Additions from purchases of PCD debt securities | 0 | 0 | 0 | 0
Additions for securities for which credit losses were not previously recognized | 6 | 1 | 8 | 21
Additions (reductions) for securities for which credit losses were previously recognized | 4 | 0 | 12 | (2)
Reductions for disposed securities | (1) |  | 0 | (1)
Reductions for securities charged-off | (5) | (5) | (11) | (18)
Balance as of end-of-period | 17 | 9 | 17 | 9
RMBS |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance as of beginning-of-period | 6 | 6 | 6 | 7
Additions from purchases of PCD debt securities | 0 | 0 | 0 | 0
Additions for securities for which credit losses were not previously recognized | 0 | 0 | 0 | 0
Additions (reductions) for securities for which credit losses were previously recognized | 1 | 0 | 1 | (1)
Reductions for disposed securities | 0 |  | 0 | 0
Reductions for securities charged-off | 0 | 0 | 0 | 0
Balance as of end-of-period | 7 | 6 | 7 | 6
ABS |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance as of beginning-of-period | 19 | 5 | 4 | 5
Additions from purchases of PCD debt securities | 0 | 0 | 0 | 0
Additions for securities for which credit losses were not previously recognized | 1 | 0 | 15 | 0
Additions (reductions) for securities for which credit losses were previously recognized | 3 | 0 | 4 | 0
Reductions for disposed securities | 0 |  | 0 | 0
Reductions for securities charged-off | 0 | 0 | 0 | 0
Balance as of end-of-period | 23 | 5 | 23 | 5
Hybrids |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance as of beginning-of-period | 1 | 1 | 1 | 1
Additions from purchases of PCD debt securities | 0 | 0 | 0 | 0
Additions for securities for which credit losses were not previously recognized | 0 | 0 | 0 | 0
Additions (reductions) for securities for which credit losses were previously recognized | 0 | 0 | 0 | 0
Reductions for disposed securities | 0 |  | 0 | 0
Reductions for securities charged-off | 0 | 0 | 0 | 0
Balance as of end-of-period | $ 1 | $ 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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