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Investments - Allowance for Credit Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Accrued interest receivables on available-for-sale fixed maturity securities | $ 451 | $ 430 | $ 451 | $ 430 | $ 435
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 17 | 22 | 16 | 1 |
Securities for which credit losses were not previously recorded | 4 | 5 | 4 | 13 |
Available-for-sale securities accounted for as PCD assets | 2 | 2 | 2 | 22 |
Securities sold during the period (realized) |  |  | 4 | 6 |
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis |  |  | 1 | 3 |
Write-offs charged against the allowance | 9 | 15 | 9 | 15 |
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period | 4 | 4 | 10 | 6 |
Ending balance | 18 | 18 | 18 | 18 |
Corporate bonds and other |  |  |  |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 0 | 13 | 4 | 0 |
Securities for which credit losses were not previously recorded | 4 | 5 | 4 | 6 |
Available-for-sale securities accounted for as PCD assets | 2 | 2 | 2 | 22 |
Securities sold during the period (realized) |  |  | 3 | 6 |
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis |  |  | 1 | 3 |
Write-offs charged against the allowance |  | 15 |  | 15 |
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period |  |  |  | 1 |
Ending balance | 6 | 5 | 6 | 5 |
Asset-backed |  |  |  |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 17 | 9 | 12 | 1 |
Securities for which credit losses were not previously recorded |  |  |  | 7 |
Available-for-sale securities accounted for as PCD assets |  |  |  |  |
Securities sold during the period (realized) |  |  | 1 |  |
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis |  |  |  |  |
Write-offs charged against the allowance | 9 |  | 9 |  |
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period | 4 | 4 | 10 | 5 |
Ending balance | $ 12 | $ 13 | $ 12 | $ 13 |

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- Definition Amount, after allowance for credit loss, 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2A Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-3A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-3B + Details
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