RELATED PARTY TRANSACTIONS - Successor Schedule of Affiliated Asset Transfers (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended	9 Months Ended
	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
Related Party Transaction [Line Items]
Investment gains (losses), net	$ (455)	$ 481	$ 5,081	$ 481	$ (1,753)		$ 7,373
Fortitude Reinsurance Company, Ltd. | Affiliated Entity
Related Party Transaction [Line Items]
Fair Value	37				37	$ 37
Book Value	37				37	37
Investment gains (losses), net						0
Fortitude Reinsurance Company, Ltd. | Affiliated Entity
Related Party Transaction [Line Items]
Fair Value	15				15	15
Book Value	15				15	15
Investment gains (losses), net						0
Fortitude Reinsurance Company, Ltd. | Affiliated Entity
Related Party Transaction [Line Items]
Fair Value	9				9	9
Book Value	9				9	9
Investment gains (losses), net						0
Fortitude Re Investments, LLC | Affiliated Entity
Related Party Transaction [Line Items]
Fair Value	42				42	42
Book Value	42				42	42
Investment gains (losses), net						0
Fortitude Re Investments, LLC | Affiliated Entity
Related Party Transaction [Line Items]
Fair Value	23				23	23
Book Value	23				23	23
Investment gains (losses), net						0
Fortitude Re Investments, LLC | Affiliated Entity
Related Party Transaction [Line Items]
Fair Value	15				15	15
Book Value	$ 15				$ 15	15
Investment gains (losses), net						$ 0