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Income Taxes (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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US Treasury Securities |  |
Operating Loss Carryforwards [Line Items] |  |
Debt securities | $ 697 | $ 596
Internal Revenue Service (IRS) |  |
Operating Loss Carryforwards [Line Items] |  |
Current federal income tax liability | $ 24 | $ 21

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