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Business and Summary of Significant Accounting Policies - Contract Holder Funds, Future Policy Benefits and Secured Trust Deposits (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Accounting Policies [Abstract] |  |
NPR, capped percentage | 100.00% |
Market risk benefit, attributed fee ratio capped percentage | 100.00% |
Secured trust deposits | $ 731 | $ 862

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- Definition Market Risk Benefit, Attributed Fee Ratio Capped Percentage + References No definition available. + Details
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- Definition Net Premium Ratio, Capped Percentage + References No definition available. + Details
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Balance Type: | na
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- References No definition available. + Details
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