REINSURANCE - Effect of Reinsurance (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended	9 Months Ended
	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2023	Sep. 30, 2023
Reinsurance Disclosures [Abstract]
Direct charges and fee income	$ 106			$ 85
Reinsurance assumed - Equitable Financial	327			0
Reinsurance ceded	(29)			(24)
Policy charges and fee income	404			61
Direct premiums	101			85
Reinsurance assumed - Equitable Financial	45			0
Reinsurance ceded	(14)			(16)
Premiums	132	$ 132	$ 132	69	$ 201	$ 333
Direct policyholders’ benefits	136			100
Reinsurance assumed - Equitable Financial	186			0
Reinsurance ceded	(31)			(21)
Policyholders’ benefits	291	$ 261	$ 278	79	$ 357	$ 618
Direct interest credited to policyholders’ account balances	116			31
Reinsurance assumed - Equitable Financial	154			0
Reinsurance ceded	(8)			(8)
Interest credited to policyholders’ account balances	$ 262			$ 23