INCOME TAXES - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2021
Current tax expense (benefit):
U.S. federal		$ 18	$ (14)	$ 241
State and local				3
Current Federal, State and Local, Tax Expense (Benefit), Total				244
Deferred tax expense (benefit):
U.S. federal		52	(8)	1,050
Deferred Federal, State and Local, Tax Expense (Benefit), Total				1,050
Less: Income tax expense (benefit)	$ 77	(34)	(6)	1,294
Income tax expense (benefit) reported in equity related to:
Other comprehensive income (loss)	$ (118)	29	(47)	(362)
Total income tax benefit		$ (5)	$ (53)	$ 932