POLICYHOLDER ACCOUNT BALANCES - Guaranteed Minimum Interest Rates (Details) $ in Millions	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
1 Basis Point - 50 Basis Points Above | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0001	0.0001
1 Basis Point - 50 Basis Points Above | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0050	0.0050
51 Basis Points - 150 Basis Points Above | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0051	0.0051
51 Basis Points - 150 Basis Points Above | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0150	0.0150
Greater Than 150 Basis Points Above | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0150	0.0150
Universal Life
Policyholder Account Balance [Line Items]
Policyholder account value	$ 1,181	$ 1,185
Universal Life | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	$ 0	$ 0
Universal Life | 0.00%-1.50% | Minimum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	0.00%	0.00%
Universal Life | 0.00%-1.50% | Maximum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	1.50%	1.50%
Universal Life | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	$ 695	$ 693
Universal Life | 1.51%-2.50% | Minimum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	1.51%	1.51%
Universal Life | 1.51%-2.50% | Maximum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	2.50%	2.50%
Universal Life | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	$ 486	$ 492
Universal Life | Greater than 2.50% | Minimum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	2.50%	2.50%
Universal Life | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Policyholder account value	$ 31	$ 47
Universal Life | At Guaranteed Minimum | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
Universal Life | At Guaranteed Minimum | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	31	47
Universal Life | At Guaranteed Minimum | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
Universal Life | 1 Basis Point - 50 Basis Points Above
Policyholder Account Balance [Line Items]
Policyholder account value	509	501
Universal Life | 1 Basis Point - 50 Basis Points Above | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
Universal Life | 1 Basis Point - 50 Basis Points Above | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	23	9
Universal Life | 1 Basis Point - 50 Basis Points Above | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	486	492
Universal Life | 51 Basis Points - 150 Basis Points Above
Policyholder Account Balance [Line Items]
Policyholder account value	300	339
Universal Life | 51 Basis Points - 150 Basis Points Above | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
Universal Life | 51 Basis Points - 150 Basis Points Above | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	300	339
Universal Life | 51 Basis Points - 150 Basis Points Above | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
Universal Life | Greater Than 150 Basis Points Above
Policyholder Account Balance [Line Items]
Policyholder account value	341	298
Universal Life | Greater Than 150 Basis Points Above | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
Universal Life | Greater Than 150 Basis Points Above | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	341	298
Universal Life | Greater Than 150 Basis Points Above | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
Indexed Universal Life
Policyholder Account Balance [Line Items]
Policyholder account value	2,344	2,331
Indexed Universal Life | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	$ 0	$ 0
Indexed Universal Life | 0.00%-1.50% | Minimum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	0.00%	0.00%
Indexed Universal Life | 0.00%-1.50% | Maximum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	1.50%	1.50%
Indexed Universal Life | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	$ 2,344	$ 2,331
Indexed Universal Life | 1.51%-2.50% | Minimum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	1.51%	1.51%
Indexed Universal Life | 1.51%-2.50% | Maximum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	2.50%	2.50%
Indexed Universal Life | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	$ 0	$ 0
Indexed Universal Life | Greater than 2.50% | Minimum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	2.50%	2.50%
Indexed Universal Life | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Policyholder account value	$ 1,116	$ 1,112
Indexed Universal Life | At Guaranteed Minimum | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
Indexed Universal Life | At Guaranteed Minimum | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	1,116	1,112
Indexed Universal Life | At Guaranteed Minimum | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
Indexed Universal Life | 1 Basis Point - 50 Basis Points Above
Policyholder Account Balance [Line Items]
Policyholder account value	152	218
Indexed Universal Life | 1 Basis Point - 50 Basis Points Above | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
Indexed Universal Life | 1 Basis Point - 50 Basis Points Above | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	152	218
Indexed Universal Life | 1 Basis Point - 50 Basis Points Above | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
Indexed Universal Life | 51 Basis Points - 150 Basis Points Above
Policyholder Account Balance [Line Items]
Policyholder account value	1,076	1,001
Indexed Universal Life | 51 Basis Points - 150 Basis Points Above | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
Indexed Universal Life | 51 Basis Points - 150 Basis Points Above | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	1,076	1,001
Indexed Universal Life | 51 Basis Points - 150 Basis Points Above | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
Indexed Universal Life | Greater Than 150 Basis Points Above
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
Indexed Universal Life | Greater Than 150 Basis Points Above | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
Indexed Universal Life | Greater Than 150 Basis Points Above | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
Indexed Universal Life | Greater Than 150 Basis Points Above | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
EQUI-VEST Individual
Policyholder Account Balance [Line Items]
Policyholder account value	1,893	1,964
EQUI-VEST Individual | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	$ 246	$ 252
EQUI-VEST Individual | 0.00%-1.50% | Minimum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	0.00%	0.00%
EQUI-VEST Individual | 0.00%-1.50% | Maximum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	1.50%	1.50%
EQUI-VEST Individual | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	$ 39	$ 42
EQUI-VEST Individual | 1.51%-2.50% | Minimum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	1.51%	1.51%
EQUI-VEST Individual | 1.51%-2.50% | Maximum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	2.50%	2.50%
EQUI-VEST Individual | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	$ 1,608	$ 1,670
EQUI-VEST Individual | Greater than 2.50% | Minimum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	2.50%	2.50%
EQUI-VEST Individual | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Policyholder account value	$ 1,692	$ 1,759
EQUI-VEST Individual | At Guaranteed Minimum | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	45	47
EQUI-VEST Individual | At Guaranteed Minimum | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	39	42
EQUI-VEST Individual | At Guaranteed Minimum | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	1,608	1,670
EQUI-VEST Individual | 1 Basis Point - 50 Basis Points Above
Policyholder Account Balance [Line Items]
Policyholder account value	201	205
EQUI-VEST Individual | 1 Basis Point - 50 Basis Points Above | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	201	205
EQUI-VEST Individual | 1 Basis Point - 50 Basis Points Above | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
EQUI-VEST Individual | 1 Basis Point - 50 Basis Points Above | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
EQUI-VEST Individual | 51 Basis Points - 150 Basis Points Above
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
EQUI-VEST Individual | 51 Basis Points - 150 Basis Points Above | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
EQUI-VEST Individual | 51 Basis Points - 150 Basis Points Above | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
EQUI-VEST Individual | 51 Basis Points - 150 Basis Points Above | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
EQUI-VEST Individual | Greater Than 150 Basis Points Above
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
EQUI-VEST Individual | Greater Than 150 Basis Points Above | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
EQUI-VEST Individual | Greater Than 150 Basis Points Above | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
EQUI-VEST Individual | Greater Than 150 Basis Points Above | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
EQUI-VEST Group
Policyholder Account Balance [Line Items]
Policyholder account value	5,602	5,707
EQUI-VEST Group | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	$ 2,775	$ 2,796
EQUI-VEST Group | 0.00%-1.50% | Minimum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	0.00%	0.00%
EQUI-VEST Group | 0.00%-1.50% | Maximum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	1.50%	1.50%
EQUI-VEST Group | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	$ 271	$ 269
EQUI-VEST Group | 1.51%-2.50% | Minimum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	1.51%	1.51%
EQUI-VEST Group | 1.51%-2.50% | Maximum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	2.50%
EQUI-VEST Group | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	$ 2,556	$ 2,642
EQUI-VEST Group | Greater than 2.50% | Minimum
Policyholder Account Balance [Line Items]
Guaranteed minimum credit rating	2.50%	2.50%
EQUI-VEST Group | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Policyholder account value	$ 3,291	$ 3,399
EQUI-VEST Group | At Guaranteed Minimum | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	464	488
EQUI-VEST Group | At Guaranteed Minimum | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	271	269
EQUI-VEST Group | At Guaranteed Minimum | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	2,556	2,642
EQUI-VEST Group | 1 Basis Point - 50 Basis Points Above
Policyholder Account Balance [Line Items]
Policyholder account value	2,035	2,020
EQUI-VEST Group | 1 Basis Point - 50 Basis Points Above | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	2,035	2,020
EQUI-VEST Group | 1 Basis Point - 50 Basis Points Above | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
EQUI-VEST Group | 1 Basis Point - 50 Basis Points Above | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
EQUI-VEST Group | 51 Basis Points - 150 Basis Points Above
Policyholder Account Balance [Line Items]
Policyholder account value	23	11
EQUI-VEST Group | 51 Basis Points - 150 Basis Points Above | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	23	11
EQUI-VEST Group | 51 Basis Points - 150 Basis Points Above | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
EQUI-VEST Group | 51 Basis Points - 150 Basis Points Above | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
EQUI-VEST Group | Greater Than 150 Basis Points Above
Policyholder Account Balance [Line Items]
Policyholder account value	253	277
EQUI-VEST Group | Greater Than 150 Basis Points Above | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Policyholder account value	253	277
EQUI-VEST Group | Greater Than 150 Basis Points Above | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	0	0
EQUI-VEST Group | Greater Than 150 Basis Points Above | Greater than 2.50%
Policyholder Account Balance [Line Items]
Policyholder account value	$ 0	$ 0