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Reinsurance - Quota Share Reinsurance (Details) - Reinsurance Policy, Type [Axis]: Quota Share Reinsurance - USD ($) $ in Billions |  | 9 Months Ended
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Dec. 31, 2021 | Sep. 30, 2023
QSR-2019 |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |
Ceding Percentage |  | 20.00%
Ceding Commission |  | 20.00%
Profit Commission | 60.00% | 63.00%
Ceded premiums earned related to percent of risk on eligible single premium policies |  | 40.00%
QSR-2022 |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |
Ceding Percentage |  | 20.00%
Ceding Commission |  | 20.00%
Profit Commission |  | 62.00%
RIF ceded |  | $ 8.1
QSR-2023 |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |
Ceding Percentage |  | 17.50%
Ceding Commission |  | 20.00%
Profit Commission |  | 58.00%

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