FAIR VALUE OF ASSETS AND LIABILITIES - Assets and Liabilities by Hierarchy Level (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fixed maturity securities
Asset-backed securities	$ 5,377	$ 5,210
Short-term investments	25	21
Other invested assets	341	211
Deposit asset	426	438
Separate account assets, at fair value	24,262	23,870
Liabilities:
Insurance liabilities, at fair value	4,545	5,003
Other liabilities	260	273
Net modified coinsurance payable	72	78
Separate account liabilities, at fair value	24,262	23,870
Mortgage loans fair value in excess of unpaid principal	4
Retained Business
Fixed maturity securities
Other invested assets	112	85
Separate account assets, at fair value	22,146	21,800
Liabilities:
Insurance liabilities, at fair value	2,342	2,835
Other liabilities	249	261
Net modified coinsurance payable	0	0
Separate account liabilities, at fair value	22,146	21,800
Mortgage loans fair value in excess of unpaid principal	4
Ceded Business
Fixed maturity securities
Other invested assets	229	126
Separate account assets, at fair value	2,116	2,070
Liabilities:
Insurance liabilities, at fair value	2,203	2,168
Other liabilities	11	12
Net modified coinsurance payable	72	78
Separate account liabilities, at fair value	2,116	2,070
Recurring
Fixed maturity securities
Asset-backed securities	5,369	5,202
Mortgage and other loans	425	437
Short-term investments	25	21
Cash and cash equivalents	441	940
Other invested assets	238	117
Netting	(483)	(694)
Deposit asset	426	438
Reinsurance recoverables	155	206
Subtotal excluding separate account assets	7,079	7,361
Separate account assets, at fair value	24,262	23,870
Total assets	31,341	31,231
Liabilities:
Insurance liabilities, at fair value	4,545	5,003
Other liabilities	53	94
Net modified coinsurance payable	72	78
Separate account liabilities, at fair value	24,262	23,870
Liabilities, Netting	(1,040)	(1,207)
Total liabilities	28,932	29,045
Recurring | Retained Business
Fixed maturity securities
Asset-backed securities	4,115	4,150
Mortgage and other loans	425	437
Cash and cash equivalents	298	534
Other invested assets	16	0
Netting	(438)	(638)
Subtotal excluding separate account assets	4,854	5,121
Separate account assets, at fair value	22,146	21,800
Total assets	27,000	26,921
Liabilities:
Insurance liabilities, at fair value	2,342	2,835
Other liabilities	53	94
Separate account liabilities, at fair value	22,146	21,800
Liabilities, Netting	(993)	(1,151)
Total liabilities	24,541	24,729
Recurring | Ceded Business
Fixed maturity securities
Asset-backed securities	1,254	1,052
Short-term investments	25	21
Cash and cash equivalents	143	406
Other invested assets	222	117
Netting	(45)	(56)
Deposit asset	426	438
Reinsurance recoverables	155	206
Subtotal excluding separate account assets	2,225	2,240
Separate account assets, at fair value	2,116	2,070
Total assets	4,341	4,310
Liabilities:
Insurance liabilities, at fair value	2,203	2,168
Other liabilities	0	0
Net modified coinsurance payable		78
Separate account liabilities, at fair value	2,116	2,070
Liabilities, Netting	(47)	(56)
Total liabilities	4,391	4,316
Recurring | U.S Treasury securities and obligations of U.S. government authorities and agencies
Fixed maturity securities
Asset-backed securities	514	581
Recurring | U.S Treasury securities and obligations of U.S. government authorities and agencies | Retained Business
Fixed maturity securities
Asset-backed securities	440	506
Recurring | U.S Treasury securities and obligations of U.S. government authorities and agencies | Ceded Business
Fixed maturity securities
Asset-backed securities	74	75
Recurring | Obligations of U.S. states and their political subdivisions
Fixed maturity securities
Asset-backed securities	125	129
Recurring | Obligations of U.S. states and their political subdivisions | Retained Business
Fixed maturity securities
Asset-backed securities	125	129
Recurring | Foreign government bonds
Fixed maturity securities
Asset-backed securities	1	1
Recurring | Foreign government bonds | Ceded Business
Fixed maturity securities
Asset-backed securities	1	1
Recurring | U.S. corporate public securities
Fixed maturity securities
Asset-backed securities	2,767	2,762
Recurring | U.S. corporate public securities | Retained Business
Fixed maturity securities
Asset-backed securities	2,048	2,099
Recurring | U.S. corporate public securities | Ceded Business
Fixed maturity securities
Asset-backed securities	719	663
Recurring | U.S. corporate private securities
Fixed maturity securities
Asset-backed securities	418	391
Recurring | U.S. corporate private securities | Retained Business
Fixed maturity securities
Asset-backed securities	271	244
Recurring | U.S. corporate private securities | Ceded Business
Fixed maturity securities
Asset-backed securities	147	147
Recurring | Foreign corporate public securities
Fixed maturity securities
Asset-backed securities	236	150
Recurring | Foreign corporate public securities | Retained Business
Fixed maturity securities
Asset-backed securities	123	124
Recurring | Foreign corporate public securities | Ceded Business
Fixed maturity securities
Asset-backed securities	113	26
Recurring | Foreign corporate private securities
Fixed maturity securities
Asset-backed securities	88	88
Recurring | Foreign corporate private securities | Retained Business
Fixed maturity securities
Asset-backed securities	57	56
Recurring | Foreign corporate private securities | Ceded Business
Fixed maturity securities
Asset-backed securities	31	32
Recurring | Asset-backed securities
Fixed maturity securities
Asset-backed securities	1,059	952
Recurring | Asset-backed securities | Retained Business
Fixed maturity securities
Asset-backed securities	1,012	952
Recurring | Asset-backed securities | Ceded Business
Fixed maturity securities
Asset-backed securities	47
Recurring | Commercial mortgage-backed securities
Fixed maturity securities
Asset-backed securities	12	12
Recurring | Commercial mortgage-backed securities | Retained Business
Fixed maturity securities
Asset-backed securities	12	12
Recurring | Residential mortgage-backed securities
Fixed maturity securities
Asset-backed securities	149	136
Recurring | Residential mortgage-backed securities | Retained Business
Fixed maturity securities
Asset-backed securities	27	28
Recurring | Residential mortgage-backed securities | Ceded Business
Fixed maturity securities
Asset-backed securities	122	108
Recurring | Level 1
Fixed maturity securities
Asset-backed securities	0	0
Mortgage and other loans	0	0
Short-term investments	3	0
Cash and cash equivalents	441	940
Other invested assets	3	0
Deposit asset	0	0
Reinsurance recoverables	0	0
Subtotal excluding separate account assets	447	940
Separate account assets, at fair value	0	0
Total assets	447	940
Liabilities:
Insurance liabilities, at fair value	0	0
Other liabilities	46	71
Net modified coinsurance payable	0	0
Separate account liabilities, at fair value	0	0
Total liabilities	46	71
Recurring | Level 1 | Retained Business
Fixed maturity securities
Asset-backed securities	0	0
Mortgage and other loans	0	0
Cash and cash equivalents	298	534
Other invested assets	3	0
Subtotal excluding separate account assets	301	534
Separate account assets, at fair value	0	0
Total assets	301	534
Liabilities:
Insurance liabilities, at fair value	0	0
Other liabilities	46	71
Separate account liabilities, at fair value	0	0
Total liabilities	46	71
Recurring | Level 1 | Ceded Business
Fixed maturity securities
Asset-backed securities	0	0
Short-term investments	3	0
Cash and cash equivalents	143	406
Other invested assets	0	0
Deposit asset	0	0
Reinsurance recoverables	0	0
Subtotal excluding separate account assets	146	406
Separate account assets, at fair value	0	0
Total assets	146	406
Liabilities:
Insurance liabilities, at fair value	0	0
Other liabilities	0	0
Net modified coinsurance payable		0
Separate account liabilities, at fair value	0	0
Total liabilities	0	0
Recurring | Level 1 | U.S Treasury securities and obligations of U.S. government authorities and agencies
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | U.S Treasury securities and obligations of U.S. government authorities and agencies | Retained Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | U.S Treasury securities and obligations of U.S. government authorities and agencies | Ceded Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | Obligations of U.S. states and their political subdivisions
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | Obligations of U.S. states and their political subdivisions | Retained Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | Foreign government bonds
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | Foreign government bonds | Ceded Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | U.S. corporate public securities
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | U.S. corporate public securities | Retained Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | U.S. corporate public securities | Ceded Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | U.S. corporate private securities
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | U.S. corporate private securities | Retained Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | U.S. corporate private securities | Ceded Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | Foreign corporate public securities
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | Foreign corporate public securities | Retained Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | Foreign corporate public securities | Ceded Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | Foreign corporate private securities
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | Foreign corporate private securities | Retained Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | Foreign corporate private securities | Ceded Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | Asset-backed securities
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | Asset-backed securities | Retained Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | Asset-backed securities | Ceded Business
Fixed maturity securities
Asset-backed securities	0
Recurring | Level 1 | Commercial mortgage-backed securities
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | Commercial mortgage-backed securities | Retained Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | Residential mortgage-backed securities
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | Residential mortgage-backed securities | Retained Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 1 | Residential mortgage-backed securities | Ceded Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 2
Fixed maturity securities
Asset-backed securities	4,749	4,649
Mortgage and other loans	0	0
Short-term investments	22	17
Cash and cash equivalents	0	0
Other invested assets	718	811
Deposit asset	0	0
Reinsurance recoverables	0	0
Subtotal excluding separate account assets	5,489	5,477
Separate account assets, at fair value	24,262	23,870
Total assets	29,751	29,347
Liabilities:
Insurance liabilities, at fair value	0	0
Other liabilities	1,047	1,230
Net modified coinsurance payable	0	0
Separate account liabilities, at fair value	24,262	23,870
Total liabilities	25,309	25,100
Recurring | Level 2 | Retained Business
Fixed maturity securities
Asset-backed securities	3,524	3,599
Mortgage and other loans	0	0
Cash and cash equivalents	0	0
Other invested assets	451	638
Subtotal excluding separate account assets	3,975	4,237
Separate account assets, at fair value	22,146	21,800
Total assets	26,121	26,037
Liabilities:
Insurance liabilities, at fair value	0	0
Other liabilities	1,000	1,174
Separate account liabilities, at fair value	22,146	21,800
Total liabilities	23,146	22,974
Recurring | Level 2 | Ceded Business
Fixed maturity securities
Asset-backed securities	1,225	1,050
Short-term investments	22	17
Cash and cash equivalents	0	0
Other invested assets	267	173
Deposit asset	0	0
Reinsurance recoverables	0	0
Subtotal excluding separate account assets	1,514	1,240
Separate account assets, at fair value	2,116	2,070
Total assets	3,630	3,310
Liabilities:
Insurance liabilities, at fair value	0	0
Other liabilities	47	56
Net modified coinsurance payable		0
Separate account liabilities, at fair value	2,116	2,070
Total liabilities	2,163	2,126
Recurring | Level 2 | U.S Treasury securities and obligations of U.S. government authorities and agencies
Fixed maturity securities
Asset-backed securities	514	581
Recurring | Level 2 | U.S Treasury securities and obligations of U.S. government authorities and agencies | Retained Business
Fixed maturity securities
Asset-backed securities	440	506
Recurring | Level 2 | U.S Treasury securities and obligations of U.S. government authorities and agencies | Ceded Business
Fixed maturity securities
Asset-backed securities	74	75
Recurring | Level 2 | Obligations of U.S. states and their political subdivisions
Fixed maturity securities
Asset-backed securities	125	129
Recurring | Level 2 | Obligations of U.S. states and their political subdivisions | Retained Business
Fixed maturity securities
Asset-backed securities	125	129
Recurring | Level 2 | Foreign government bonds
Fixed maturity securities
Asset-backed securities	1	1
Recurring | Level 2 | Foreign government bonds | Ceded Business
Fixed maturity securities
Asset-backed securities	1	1
Recurring | Level 2 | U.S. corporate public securities
Fixed maturity securities
Asset-backed securities	2,767	2,762
Recurring | Level 2 | U.S. corporate public securities | Retained Business
Fixed maturity securities
Asset-backed securities	2,048	2,099
Recurring | Level 2 | U.S. corporate public securities | Ceded Business
Fixed maturity securities
Asset-backed securities	719	663
Recurring | Level 2 | U.S. corporate private securities
Fixed maturity securities
Asset-backed securities	146	146
Recurring | Level 2 | U.S. corporate private securities | Retained Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 2 | U.S. corporate private securities | Ceded Business
Fixed maturity securities
Asset-backed securities	146	146
Recurring | Level 2 | Foreign corporate public securities
Fixed maturity securities
Asset-backed securities	236	150
Recurring | Level 2 | Foreign corporate public securities | Retained Business
Fixed maturity securities
Asset-backed securities	123	124
Recurring | Level 2 | Foreign corporate public securities | Ceded Business
Fixed maturity securities
Asset-backed securities	113	26
Recurring | Level 2 | Foreign corporate private securities
Fixed maturity securities
Asset-backed securities	31	31
Recurring | Level 2 | Foreign corporate private securities | Retained Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 2 | Foreign corporate private securities | Ceded Business
Fixed maturity securities
Asset-backed securities	31	31
Recurring | Level 2 | Asset-backed securities
Fixed maturity securities
Asset-backed securities	773	706
Recurring | Level 2 | Asset-backed securities | Retained Business
Fixed maturity securities
Asset-backed securities	754	706
Recurring | Level 2 | Asset-backed securities | Ceded Business
Fixed maturity securities
Asset-backed securities	19
Recurring | Level 2 | Commercial mortgage-backed securities
Fixed maturity securities
Asset-backed securities	12	12
Recurring | Level 2 | Commercial mortgage-backed securities | Retained Business
Fixed maturity securities
Asset-backed securities	12	12
Recurring | Level 2 | Residential mortgage-backed securities
Fixed maturity securities
Asset-backed securities	144	131
Recurring | Level 2 | Residential mortgage-backed securities | Retained Business
Fixed maturity securities
Asset-backed securities	22	23
Recurring | Level 2 | Residential mortgage-backed securities | Ceded Business
Fixed maturity securities
Asset-backed securities	122	108
Recurring | Level 3
Fixed maturity securities
Asset-backed securities	620	553
Mortgage and other loans	425	437
Short-term investments	0	4
Cash and cash equivalents	0	0
Other invested assets	0	0
Deposit asset	426	438
Reinsurance recoverables	155	206
Subtotal excluding separate account assets	1,626	1,638
Separate account assets, at fair value	0	0
Total assets	1,626	1,638
Liabilities:
Insurance liabilities, at fair value	4,545	5,003
Other liabilities	0	0
Net modified coinsurance payable	72	78
Separate account liabilities, at fair value	0	0
Total liabilities	4,617	5,081
Recurring | Level 3 | Retained Business
Fixed maturity securities
Asset-backed securities	591	551
Mortgage and other loans	425	437
Cash and cash equivalents	0	0
Other invested assets	0
Subtotal excluding separate account assets	1,016	988
Separate account assets, at fair value	0	0
Total assets	1,016	988
Liabilities:
Insurance liabilities, at fair value	2,342	2,835
Other liabilities	0	0
Separate account liabilities, at fair value	0	0
Total liabilities	2,342	2,835
Recurring | Level 3 | Ceded Business
Fixed maturity securities
Asset-backed securities	29	2
Short-term investments	0	4
Cash and cash equivalents	0	0
Other invested assets	0	0
Deposit asset	426	438
Reinsurance recoverables	155	206
Subtotal excluding separate account assets	610	650
Separate account assets, at fair value	0	0
Total assets	610	650
Liabilities:
Insurance liabilities, at fair value	2,203	2,168
Other liabilities	0	0
Net modified coinsurance payable		78
Separate account liabilities, at fair value	0	0
Total liabilities	2,275	2,246
Recurring | Level 3 | U.S Treasury securities and obligations of U.S. government authorities and agencies
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 3 | U.S Treasury securities and obligations of U.S. government authorities and agencies | Retained Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 3 | U.S Treasury securities and obligations of U.S. government authorities and agencies | Ceded Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 3 | Obligations of U.S. states and their political subdivisions
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 3 | Obligations of U.S. states and their political subdivisions | Retained Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 3 | Foreign government bonds
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 3 | Foreign government bonds | Ceded Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 3 | U.S. corporate public securities
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 3 | U.S. corporate public securities | Retained Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 3 | U.S. corporate public securities | Ceded Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 3 | U.S. corporate private securities
Fixed maturity securities
Asset-backed securities	272	245
Recurring | Level 3 | U.S. corporate private securities | Retained Business
Fixed maturity securities
Asset-backed securities	271	244
Recurring | Level 3 | U.S. corporate private securities | Ceded Business
Fixed maturity securities
Asset-backed securities	1	1
Recurring | Level 3 | Foreign corporate public securities
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 3 | Foreign corporate public securities | Retained Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 3 | Foreign corporate public securities | Ceded Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 3 | Foreign corporate private securities
Fixed maturity securities
Asset-backed securities	57	57
Recurring | Level 3 | Foreign corporate private securities | Retained Business
Fixed maturity securities
Asset-backed securities	57	56
Recurring | Level 3 | Foreign corporate private securities | Ceded Business
Fixed maturity securities
Asset-backed securities	0	1
Recurring | Level 3 | Asset-backed securities
Fixed maturity securities
Asset-backed securities	286	246
Recurring | Level 3 | Asset-backed securities | Retained Business
Fixed maturity securities
Asset-backed securities	258	246
Recurring | Level 3 | Asset-backed securities | Ceded Business
Fixed maturity securities
Asset-backed securities	28
Recurring | Level 3 | Commercial mortgage-backed securities
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 3 | Commercial mortgage-backed securities | Retained Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Level 3 | Residential mortgage-backed securities
Fixed maturity securities
Asset-backed securities	5	5
Recurring | Level 3 | Residential mortgage-backed securities | Retained Business
Fixed maturity securities
Asset-backed securities	5	5
Recurring | Level 3 | Residential mortgage-backed securities | Ceded Business
Fixed maturity securities
Asset-backed securities	0	0
Recurring | Fair Value Measured at Net Asset Value Per Share | Fixed Maturities
Liabilities:
Other invested assets excluded from fair value hierarchy	8	8
Recurring | Fair Value Measured at Net Asset Value Per Share | Fixed Maturities | Retained Business
Liabilities:
Other invested assets excluded from fair value hierarchy	8
Recurring | Fair Value Measured at Net Asset Value Per Share | Private equity
Liabilities:
Other invested assets excluded from fair value hierarchy	29	24
Recurring | Fair Value Measured at Net Asset Value Per Share | Private equity | Retained Business
Liabilities:
Other invested assets excluded from fair value hierarchy	28
Recurring | Fair Value Measured at Net Asset Value Per Share | Private equity | Ceded Business
Liabilities:
Other invested assets excluded from fair value hierarchy	1
Other | Recurring
Fixed maturity securities
Netting	(483)	(694)
Subtotal excluding separate account assets	483	694
Other | Recurring | Retained Business
Fixed maturity securities
Netting	(438)	(638)
Subtotal excluding separate account assets	438	638
Other | Recurring | Ceded Business
Fixed maturity securities
Netting	(45)	(56)
Subtotal excluding separate account assets	45
Other liabilities - derivatives | Recurring
Liabilities:
Liabilities, Netting	(1,040)	(1,207)
Other liabilities - derivatives | Recurring | Retained Business
Liabilities:
Liabilities, Netting	(993)	(1,151)
Other liabilities - derivatives | Recurring | Ceded Business
Liabilities:
Liabilities, Netting	$ (47)	$ (56)