INVESTMENTS - PREDECESSOR COMPANY - Realized Gains (Losses) on Investments (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-Sale [Line Items]
Proceeds from maturities/prepayments	$ 422,000	$ 0	$ 9,400,000	$ 708,000
Fixed Maturities
Debt Securities, Available-for-Sale [Line Items]
Proceeds from sales	294,000		8,319,000	671,000
Proceeds from maturities/prepayments	108,000		828,000	311,000
Gross investment gains on sales and maturities	0		1,413,000	20,000
Gross investment losses on sales and maturities	(21,000)		(88,000)	(22,000)
Write-downs recognized in earnings	0		(23,000)	(1,000)
(Addition to) release of allowance for credit losses	0		0	(1,000)
Noncash related proceeds	$ (20,300)		$ (253,400)	$ (273,500)