RELATED PARTY TRANSACTIONS - Successor Schedule of Affiliated Asset Transfers (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Investment Gains (Losses), net	$ 481,000	$ (1,907,000)		$ 7,489,000	$ (5,261,000)
Fortitude Reinsurance Company, Ltd. | Affiliated Entity
Related Party Transaction [Line Items]
Fair Value		37,000	$ 37,000
Book Value		37,000	37,000
Investment Gains (Losses), net			0
Fortitude Reinsurance Company, Ltd. | Affiliated Entity
Related Party Transaction [Line Items]
Fair Value		15,000	15,000
Book Value		15,000	15,000
Investment Gains (Losses), net			0
Fortitude Reinsurance Company, Ltd. | Affiliated Entity
Related Party Transaction [Line Items]
Fair Value		9,000	9,000
Book Value		9,000	9,000
Investment Gains (Losses), net			0
Fortitude Re Investments, LLC | Affiliated Entity
Related Party Transaction [Line Items]
Fair Value		42,000	42,000
Book Value		42,000	42,000
Investment Gains (Losses), net			0
Fortitude Re Investments, LLC | Affiliated Entity
Related Party Transaction [Line Items]
Fair Value		23,000	23,000
Book Value		23,000	23,000
Investment Gains (Losses), net			0
Fortitude Re Investments, LLC | Affiliated Entity
Related Party Transaction [Line Items]
Fair Value		15,000	15,000
Book Value		$ 15,000	15,000
Investment Gains (Losses), net			$ 0