POLICYHOLDER ACCOUNT BALANCES - Balances and Changes in Separate Accounts Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Separate Account, Liability [Roll Forward]
Balance, beginning of year	$ 3,374
Balance, end of year	5,754	$ 3,374
VUL
Separate Account, Liability [Roll Forward]
Balance, beginning of year	1,653	1,832
Premiums and deposits	407	358
Policy charges	(133)	(116)
Surrenders and withdrawals	(47)	(28)
Benefit payments	(10)	(9)
Investment performance	315	(335)
Net transfers from (to) general account	(57)	(49)
Other charges	0	0
Balance, end of year	2,128	1,653
Cash surrender value	1,796	1,338
GMxB Core
Separate Account, Liability [Roll Forward]
Balance, beginning of year	756	315
Premiums and deposits	1,117	536
Policy charges	(12)	(4)
Surrenders and withdrawals	(37)	(12)
Benefit payments	(6)	(2)
Investment performance	188	(77)
Net transfers from (to) general account	160	0
Other charges	0	0
Balance, end of year	2,166	756
Cash surrender value	2,011	693
IE
Separate Account, Liability [Roll Forward]
Balance, beginning of year	26	0
Premiums and deposits	511	0
Policy charges	0	33
Surrenders and withdrawals	(6)	0
Benefit payments	0	0
Investment performance	15	0
Net transfers from (to) general account	(320)	(7)
Other charges	0	0
Balance, end of year	226	26
Cash surrender value	216	25
Reinsured
Separate Account, Liability [Roll Forward]
Balance, beginning of year	913	1,244
Premiums and deposits	21	0
Policy charges	(32)	(35)
Surrenders and withdrawals	(70)	0
Benefit payments	(16)	0
Investment performance	(2)	(247)
Net transfers from (to) general account	208	(49)
Other charges	0	0
Balance, end of year	1,022	913
Cash surrender value	$ 0	$ 0