INVESTMENTS - PREDECESSOR COMPANY - Net unrealized Gains (Losses) on Investments within AOCI (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Investment Income [Line Items]
Net unrealized gains (losses) on investments	$ (312)	$ 240	$ 2,369
Fixed maturity securities
Net Investment Income [Line Items]
Net unrealized gains (losses) on investments	$ (285)
Fixed maturity securities | Fixed Maturity Securities Available For Sale Without An Allowance
Net Investment Income [Line Items]
Net unrealized gains (losses) on investments		216	2,407
Derivatives designated as cash flow hedges
Net Investment Income [Line Items]
Net unrealized gains (losses) on investments		25	(43)
Affiliated notes
Net Investment Income [Line Items]
Net unrealized gains (losses) on investments		$ 0	$ 5