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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |
Fixed income securities, at fair value | $ 57,186 | $ 52,747
Assets at fair value | 71,430 | 63,521
Fixed Income Securities Valued Based on Nonbinding Broker Quotes |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |
Assets at fair value | 25 | 22
Municipal Not Rated by Third Party Credit Rating Agencies |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |
Assets at fair value | 3 | 2
Significant unobservable inputs (Level 3) |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |
Assets at fair value | 866 | 805
Recurring basis |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |
Fixed income securities, at fair value | 57,186 | 52,747
Assets at fair value | 71,330 | 63,518
Recurring basis | Significant unobservable inputs (Level 3) |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |
Fixed income securities, at fair value | 306 | 248
Debt securities valued based on third-party discounted cash flow pricing models | 82 | 87
Assets at fair value | 766 | $ 802
Limited partnership interests |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |
Commitments to invest in limited partnership interests | $ 127 |
Limited partnership interests | Minimum |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |
Investment assets, useful life (in years) | 10 years |
Limited partnership interests | Maximum |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |
Investment assets, useful life (in years) | 12 years |

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- Definition This element represents commitments to acquire financial interests or instruments, to allow for additional participation in certain limited partnership investments. Because the equity investments in the limited partnerships are not actively traded, it is not practical to estimate the fair value of these commitments. + References No definition available. + Details
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- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount excluding accrued interest, of 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/2009/role/commonPracticeRef -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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