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Equity Securities - Equity Securities by Market Sector Distribution (Details) - Equity securities - Industry sector | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items] |  |
Percentage | 100.00% | 100.00%
Energy and utilities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Percentage | 30.00% | 30.00%
Finance |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Percentage | 17.00% | 24.00%
Healthcare |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Percentage | 6.00% | 9.00%
Industrials |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Percentage | 9.00% | 3.00%
Information technology |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Percentage | 20.00% | 18.00%
Education |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Percentage | 11.00% | 0.00%
Other |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Percentage | 7.00% | 16.00%

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