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Income Taxes (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Net federal income tax liability, current | $ 23 | $ 21
US Treasury Securities |  |
Operating Loss Carryforwards [Line Items] |  |
Debt securities | $ 838 | $ 750

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