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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |
Fixed income securities, at fair value | $ 50,777 | $ 48,865
Assets at fair value | 57,452 | 56,409
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 | 23 | 26
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 | 8 | 11
Significant unobservable inputs (Level 3) |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |
Assets at fair value | 694 | 691
Recurring basis |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |
Fixed income securities, at fair value | 50,777 | 48,865
Assets at fair value | 57,452 | 56,394
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 | 143 | 153
Assets at fair value | 694 | $ 676
Limited partnership interests |  |
Fair value of assets and liabilities measured on recurring and non-recurring basis |  |
Commitments to invest in limited partnership interests | $ 172 |
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 Investment Assets, Useful Life + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: 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 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 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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