INCOME TAXES - Schedule of Income before Income Tax, Domestic and Foreign (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Expected federal income tax benefit		$ (67)	$ (2)		$ 1,314
Goodwill impairment			2000000000.00%	0.00%
Change in valuation allowance		37	$ (1)
Non-taxable investment income		5	7		12
Transfer pricing adjustment			(6)	$ 0
Foreign taxes			(3)	$ 0
Prior year true-up		0	(6)
Tax credits					10
Other		1	(1)		2
Less: Income tax expense (benefit)	$ 77	$ (34)	$ (6)		$ 1,294
Effective tax rate		10.70%	63.90%		20.70%