SEGMENT INFORMATION - Schedule of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended						6 Months Ended	9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2022	Sep. 30, 2023
REVENUES
Premiums	$ 8			$ 8		$ 8	$ 11	$ 22
Policy charges and fee income	113			131		97	261	345
Net investment income	73			92		99	189	227
Asset management and service fees	23			26		20	48	68
Other income	1							5
Other losses				(16)			(15)
Investment gains (losses), net	(482)			(455)		481	(1,753)	(604)
TOTAL REVENUES	(264)			(214)		686	(1,259)	63
BENEFITS AND EXPENSES
Policyholder benefits and changes in fair value of insurance liabilities	(177)			(104)			(974)	(92)
Commission expense	22			27		35	45	68
Goodwill impairment	93			0		0	0	93
General, administrative and other expenses	21			17		3	55	55
TOTAL BENEFITS AND EXPENSES	(41)			(60)		253	(874)	124
INCOME (LOSS) FROM OPERATIONS BEFORE INCOME TAXES	(223)			(154)		433	(385)	(61)
Income tax expense (benefit)	(29)			3		77	(48)	(4)
NET INCOME (LOSS)	(194)			(157)		356	(337)	(57)
Other comprehensive income (loss), before tax:
Changes in own-credit risk related to insurance liabilities	(45)			149		0	394	(138)
Less: Income tax expense	(9)			32	$ 51	(118)	83	(29)
Other comprehensive income (loss), net of tax	(36)	$ (90)	$ 17	117	$ 194	(443)	311	(109)
COMPREHENSIVE LOSS	(230)			(40)		$ (87)	(26)	(166)
Retained Business
REVENUES
Premiums	8			8			11	22
Policy charges and fee income	113			131			261	345
Net investment income	56			47			82	170
Asset management and service fees	23			26			48	68
Other income	1							4
Other losses				(4)			(4)
Investment gains (losses), net	(433)			(463)			(571)	(806)
TOTAL REVENUES	(232)			(255)			(173)	(197)
BENEFITS AND EXPENSES
Policyholder benefits and changes in fair value of insurance liabilities	(145)			(145)			112	(352)
Commission expense	22			27			45	68
Goodwill impairment	93							93
General, administrative and other expenses	21			17			55	55
TOTAL BENEFITS AND EXPENSES	(9)			(101)			212	(136)
INCOME (LOSS) FROM OPERATIONS BEFORE INCOME TAXES	(223)			(154)			(385)	(61)
Income tax expense (benefit)	(29)			3			(48)	(4)
NET INCOME (LOSS)	(194)			(157)			(337)	(57)
Other comprehensive income (loss), before tax:
Changes in own-credit risk related to insurance liabilities	(45)			149			394	(138)
Less: Income tax expense	(9)			32			83	(29)
Other comprehensive income (loss), net of tax	(36)			117			311	(109)
COMPREHENSIVE LOSS	(230)			(40)			(26)	(166)
Ceded Business
REVENUES
Premiums	0			0			0	0
Policy charges and fee income	0			0			0	0
Net investment income	17			45			107	57
Asset management and service fees	0			0			0	0
Other income	0							1
Other losses				(12)			(11)
Investment gains (losses), net	(49)			8			(1,182)	202
TOTAL REVENUES	(32)			41			(1,086)	260
BENEFITS AND EXPENSES
Policyholder benefits and changes in fair value of insurance liabilities	(32)			41			(1,086)	260
Commission expense	0			0			0	0
Goodwill impairment	0							0
General, administrative and other expenses	0			0			0	0
TOTAL BENEFITS AND EXPENSES	(32)			41			(1,086)	260
INCOME (LOSS) FROM OPERATIONS BEFORE INCOME TAXES	0			0			0	0
Income tax expense (benefit)	0			0			0	0
NET INCOME (LOSS)	0			0			0	0
Other comprehensive income (loss), before tax:
Changes in own-credit risk related to insurance liabilities	0			0			0	0
Less: Income tax expense	0			0			0	0
Other comprehensive income (loss), net of tax	0			0			0	0
COMPREHENSIVE LOSS	$ 0			$ 0			$ 0	$ 0