Reinsurance - Quota Share Reinsurance (Details) - Reinsurance Policy, Type [Axis]: Quota Share Reinsurance - USD ($) $ in Billions		3 Months Ended	12 Months Ended
	Dec. 31, 2021	Mar. 31, 2023	Dec. 31, 2022
QSR-2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceded premiums earned related to percent of risk on all other eligible policies written		20.00%
Ceding commission		20.00%
Profit commission, maximum	60.00%	63.00%	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]
Ceded premiums earned related to percent of risk on all other eligible policies written		20.00%
Ceding commission		20.00%
Profit commission, maximum		62.00%
RIF ceded		$ 7.3
QSR-2023
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceded premiums earned related to percent of risk on all other eligible policies written		17.50%
Ceding commission		20.00%
Profit commission, maximum		58.00%