DAC AND OTHER DEFERRED ASSETS/LIABILITIES - Reconciliation of DAC (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2020
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	$ 4,771	$ 4,814	$ 4,098
Term | Protection Solutions
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	344	362	403
UL | Protection Solutions
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	22	20	5
VUL | Protection Solutions
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	160	112	6
GMxB Core | Individual Retirement
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	1,509	1,585	1,646
EQUI-VEST Individual | Individual Retirement
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	151	156	154
Investment Edge | Individual Retirement
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	150	147	94
SCS | Individual Retirement
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	1,281	1,266
GMxB Legacy | Legacy Segment
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	210	213	200
EQUI-VEST Group | Group Retirement
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	718	711	634
Momentum | Group Retirement
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	83	89	$ 101
Closed Block | Corporate and Others
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	119	127
Others | Corporate and Others
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	$ 24	$ 26