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INVESTMENTS - SUCCESSOR COMPANY - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Investment Income [Line Items]
Gross investment income	$ 103	$ 259	$ 517	$ 606
Less: investment expenses	(4)	(4)	(27)	(27)
Net investment income	99	255	490	579
Retained Business
Net Investment Income [Line Items]
Gross investment income		127
Less: investment expenses		(2)
Net investment income		125
Ceded Business
Net Investment Income [Line Items]
Gross investment income		132
Less: investment expenses		(2)
Net investment income		130
Fixed maturity securities
Net Investment Income [Line Items]
Gross investment income	61	217	383	455
Fixed maturity securities \| Retained Business
Net Investment Income [Line Items]
Gross investment income		123
Fixed maturity securities \| Ceded Business
Net Investment Income [Line Items]
Gross investment income		94
Equity securities
Net Investment Income [Line Items]
Gross investment income	1	3	5	1
Equity securities \| Retained Business
Net Investment Income [Line Items]
Gross investment income		0
Equity securities \| Ceded Business
Net Investment Income [Line Items]
Gross investment income		3
Secured receivable
Net Investment Income [Line Items]
Gross investment income		18
Secured receivable \| Retained Business
Net Investment Income [Line Items]
Gross investment income		0
Secured receivable \| Ceded Business
Net Investment Income [Line Items]
Gross investment income		18
Mortgage and other loans
Net Investment Income [Line Items]
Gross investment income	11	2	65	56
Mortgage and other loans \| Retained Business
Net Investment Income [Line Items]
Gross investment income		2
Mortgage and other loans \| Ceded Business
Net Investment Income [Line Items]
Gross investment income		0
Other invested assets
Net Investment Income [Line Items]
Gross investment income	29	9	63	44
Other invested assets \| Retained Business
Net Investment Income [Line Items]
Gross investment income		2
Other invested assets \| Ceded Business
Net Investment Income [Line Items]
Gross investment income		7
Short-term investments and cash equivalents
Net Investment Income [Line Items]
Gross investment income	$ 1	10	$ 1	$ 50
Short-term investments and cash equivalents \| Retained Business
Net Investment Income [Line Items]
Gross investment income		0
Short-term investments and cash equivalents \| Ceded Business
Net Investment Income [Line Items]
Gross investment income		$ 10