FAIR VALUE OF ASSETS AND LIABILITIES - Assets and Liabilities by Hierarchy Level (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Fixed maturity securities
Fixed maturity securities, at fair value	$ 5,382	$ 5,210
Short-term investments	22	21
Other invested assets	409	211
Other invested assets, Netting	0	0
Deposit asset	404	438
Separate account assets, at fair value	23,675	23,870
Liabilities:
Insurance liabilities, at fair value	4,386	5,003
Other liabilities	318	273
Net modified coinsurance payable	128	78
Separate account liabilities, at fair value	23,675	23,870
Retained Business
Fixed maturity securities
Other invested assets	147	85
Other invested assets, Netting	0	0
Separate account assets, at fair value	21,598	21,800
Liabilities:
Insurance liabilities, at fair value	2,233	2,835
Other liabilities	303	261
Net modified coinsurance payable	0	0
Separate account liabilities, at fair value	21,598	21,800
Mortgage loans fair value in excess of unpaid principal	2
Ceded Business
Fixed maturity securities
Other invested assets	262	126
Other invested assets, Netting	0	0
Separate account assets, at fair value	2,077	2,070
Liabilities:
Insurance liabilities, at fair value	2,153	2,168
Other liabilities	15	12
Net modified coinsurance payable	128	78
Separate account liabilities, at fair value	2,077	2,070
Recurring
Fixed maturity securities
Fixed maturity securities, at fair value	5,372	5,202
Mortgage loans	382	437
Short-term investments	22	21
Cash and cash equivalents	379	940
Other invested assets	282	117
Other invested assets, Netting	(545)	(694)
Deposit asset	404	438
Reinsurance recoverables	151	206
Subtotal excluding separate account assets	6,992	7,361
Separate account assets, at fair value	23,675	23,870
Total assets	30,667	31,231
Liabilities:
Insurance liabilities, at fair value	4,386	5,003
Other liabilities	148	94
Net modified coinsurance payable	128	78
Separate account liabilities, at fair value	23,675	23,870
Liabilities, Netting	(911)	(1,207)
Total liabilities	28,337	29,045
Recurring | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	4,009	4,150
Mortgage loans	382	437
Short-term investments	2
Cash and cash equivalents	294	534
Other invested assets	26	0
Other invested assets, Netting	(507)	(638)
Subtotal excluding separate account assets	4,713	5,121
Separate account assets, at fair value	21,598	21,800
Total assets	26,311	26,921
Liabilities:
Insurance liabilities, at fair value	2,233	2,835
Other liabilities	143	94
Separate account liabilities, at fair value	21,598	21,800
Liabilities, Netting	(873)	(1,151)
Total liabilities	23,974	24,729
Recurring | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	1,363	1,052
Short-term investments	20	21
Cash and cash equivalents	85	406
Other invested assets	256	117
Other invested assets, Netting	(38)	(56)
Deposit asset	404	438
Reinsurance recoverables	151	206
Subtotal excluding separate account assets	2,279	2,240
Separate account assets, at fair value	2,077	2,070
Total assets	4,356	4,310
Liabilities:
Insurance liabilities, at fair value	2,153	2,168
Other liabilities	5	0
Net modified coinsurance payable		78
Separate account liabilities, at fair value	2,077	2,070
Liabilities, Netting	(38)	(56)
Total liabilities	4,363	4,316
Recurring | U.S Treasury securities and obligations of U.S. government authorities and agencies
Fixed maturity securities
Fixed maturity securities, at fair value	504	581
Recurring | U.S Treasury securities and obligations of U.S. government authorities and agencies | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	429	506
Recurring | U.S Treasury securities and obligations of U.S. government authorities and agencies | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	75	75
Recurring | Obligations of U.S. states and their political subdivisions
Fixed maturity securities
Fixed maturity securities, at fair value	116	129
Recurring | Obligations of U.S. states and their political subdivisions | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	116	129
Recurring | Foreign government bonds
Fixed maturity securities
Fixed maturity securities, at fair value	1	1
Recurring | Foreign government bonds | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	1	1
Recurring | U.S. corporate public securities
Fixed maturity securities
Fixed maturity securities, at fair value	2,779	2,762
Recurring | U.S. corporate public securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	1,992	2,099
Recurring | U.S. corporate public securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	787	663
Recurring | U.S. corporate private securities
Fixed maturity securities
Fixed maturity securities, at fair value	414	391
Recurring | U.S. corporate private securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	267	244
Recurring | U.S. corporate private securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	147	147
Recurring | Foreign corporate public securities
Fixed maturity securities
Fixed maturity securities, at fair value	256	150
Recurring | Foreign corporate public securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	121	124
Recurring | Foreign corporate public securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	135	26
Recurring | Foreign corporate private securities
Fixed maturity securities
Fixed maturity securities, at fair value	86	88
Recurring | Foreign corporate private securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	56	56
Recurring | Foreign corporate private securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	30	32
Recurring | Asset-backed securities
Fixed maturity securities
Fixed maturity securities, at fair value	1,062	952
Recurring | Asset-backed securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	992	952
Recurring | Asset-backed securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	70
Recurring | Commercial mortgage-backed securities
Fixed maturity securities
Fixed maturity securities, at fair value	12	12
Recurring | Commercial mortgage-backed securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	12	12
Recurring | Residential mortgage-backed securities
Fixed maturity securities
Fixed maturity securities, at fair value	142	136
Recurring | Residential mortgage-backed securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	24	28
Recurring | Residential mortgage-backed securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	118	108
Recurring | Level 1
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Mortgage loans	0	0
Short-term investments	0	0
Cash and cash equivalents	379	940
Other invested assets	1	0
Deposit asset	0	0
Reinsurance recoverables	0	0
Subtotal excluding separate account assets	380	940
Separate account assets, at fair value	0	0
Total assets	380	940
Liabilities:
Insurance liabilities, at fair value	0	0
Other liabilities	8	71
Net modified coinsurance payable	0	0
Separate account liabilities, at fair value	0	0
Total liabilities	8	71
Recurring | Level 1 | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Mortgage loans	0	0
Short-term investments	0
Cash and cash equivalents	294	534
Other invested assets	1	0
Subtotal excluding separate account assets	295	534
Separate account assets, at fair value	0	0
Total assets	295	534
Liabilities:
Insurance liabilities, at fair value	0	0
Other liabilities	8	71
Separate account liabilities, at fair value	0	0
Total liabilities	8	71
Recurring | Level 1 | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Short-term investments	0	0
Cash and cash equivalents	85	406
Other invested assets	0	0
Deposit asset	0	0
Reinsurance recoverables	0	0
Subtotal excluding separate account assets	85	406
Separate account assets, at fair value	0	0
Total assets	85	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
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | U.S Treasury securities and obligations of U.S. government authorities and agencies | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | U.S Treasury securities and obligations of U.S. government authorities and agencies | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | Obligations of U.S. states and their political subdivisions
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | Obligations of U.S. states and their political subdivisions | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | Foreign government bonds
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | Foreign government bonds | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | U.S. corporate public securities
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | U.S. corporate public securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | U.S. corporate public securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | U.S. corporate private securities
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | U.S. corporate private securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | U.S. corporate private securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | Foreign corporate public securities
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | Foreign corporate public securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | Foreign corporate public securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | Foreign corporate private securities
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | Foreign corporate private securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | Foreign corporate private securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | Asset-backed securities
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | Asset-backed securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | Asset-backed securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	0
Recurring | Level 1 | Commercial mortgage-backed securities
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | Commercial mortgage-backed securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | Residential mortgage-backed securities
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | Residential mortgage-backed securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 1 | Residential mortgage-backed securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 2
Fixed maturity securities
Fixed maturity securities, at fair value	4,767	4,649
Mortgage loans	0	0
Short-term investments	22	17
Cash and cash equivalents	0	0
Other invested assets	826	811
Deposit asset	0	0
Reinsurance recoverables	0	0
Subtotal excluding separate account assets	5,615	5,477
Separate account assets, at fair value	23,675	23,870
Total assets	29,290	29,347
Liabilities:
Insurance liabilities, at fair value	0	0
Other liabilities	1,051	1,230
Net modified coinsurance payable	0	0
Separate account liabilities, at fair value	23,675	23,870
Total liabilities	24,726	25,100
Recurring | Level 2 | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	3,422	3,599
Mortgage loans	0	0
Short-term investments	2
Cash and cash equivalents	0	0
Other invested assets	532	638
Subtotal excluding separate account assets	3,956	4,237
Separate account assets, at fair value	21,598	21,800
Total assets	25,554	26,037
Liabilities:
Insurance liabilities, at fair value		0
Other liabilities	1,008	1,174
Separate account liabilities, at fair value	21,598	21,800
Total liabilities	22,606	22,974
Recurring | Level 2 | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	1,345	1,050
Short-term investments	20	17
Cash and cash equivalents	0	0
Other invested assets	294	173
Deposit asset	0	0
Reinsurance recoverables	0	0
Subtotal excluding separate account assets	1,659	1,240
Separate account assets, at fair value	2,077	2,070
Total assets	3,736	3,310
Liabilities:
Insurance liabilities, at fair value	0	0
Other liabilities	43	56
Net modified coinsurance payable		0
Separate account liabilities, at fair value	2,077	2,070
Total liabilities	2,120	2,126
Recurring | Level 2 | U.S Treasury securities and obligations of U.S. government authorities and agencies
Fixed maturity securities
Fixed maturity securities, at fair value	504	581
Recurring | Level 2 | U.S Treasury securities and obligations of U.S. government authorities and agencies | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	429	506
Recurring | Level 2 | U.S Treasury securities and obligations of U.S. government authorities and agencies | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	75	75
Recurring | Level 2 | Obligations of U.S. states and their political subdivisions
Fixed maturity securities
Fixed maturity securities, at fair value	116	129
Recurring | Level 2 | Obligations of U.S. states and their political subdivisions | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	116	129
Recurring | Level 2 | Foreign government bonds
Fixed maturity securities
Fixed maturity securities, at fair value	1	1
Recurring | Level 2 | Foreign government bonds | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	1	1
Recurring | Level 2 | U.S. corporate public securities
Fixed maturity securities
Fixed maturity securities, at fair value	2,779	2,762
Recurring | Level 2 | U.S. corporate public securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	1,992	2,099
Recurring | Level 2 | U.S. corporate public securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	787	663
Recurring | Level 2 | U.S. corporate private securities
Fixed maturity securities
Fixed maturity securities, at fair value	145	146
Recurring | Level 2 | U.S. corporate private securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 2 | U.S. corporate private securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	145	146
Recurring | Level 2 | Foreign corporate public securities
Fixed maturity securities
Fixed maturity securities, at fair value	256	150
Recurring | Level 2 | Foreign corporate public securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	121	124
Recurring | Level 2 | Foreign corporate public securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	135	26
Recurring | Level 2 | Foreign corporate private securities
Fixed maturity securities
Fixed maturity securities, at fair value	30	31
Recurring | Level 2 | Foreign corporate private securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 2 | Foreign corporate private securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	30	31
Recurring | Level 2 | Asset-backed securities
Fixed maturity securities
Fixed maturity securities, at fair value	787	706
Recurring | Level 2 | Asset-backed securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	733	706
Recurring | Level 2 | Asset-backed securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	54
Recurring | Level 2 | Commercial mortgage-backed securities
Fixed maturity securities
Fixed maturity securities, at fair value	12	12
Recurring | Level 2 | Commercial mortgage-backed securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	12	12
Recurring | Level 2 | Residential mortgage-backed securities
Fixed maturity securities
Fixed maturity securities, at fair value	137	131
Recurring | Level 2 | Residential mortgage-backed securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	19	23
Recurring | Level 2 | Residential mortgage-backed securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	118	108
Recurring | Level 3
Fixed maturity securities
Fixed maturity securities, at fair value	605	553
Mortgage loans	382	437
Short-term investments	0	4
Cash and cash equivalents	0	0
Other invested assets	0	0
Deposit asset	404	438
Reinsurance recoverables	151	206
Subtotal excluding separate account assets	1,542	1,638
Separate account assets, at fair value	0	0
Total assets	1,542	1,638
Liabilities:
Insurance liabilities, at fair value	4,386	5,003
Other liabilities	0	0
Net modified coinsurance payable	128	78
Separate account liabilities, at fair value	0	0
Total liabilities	4,514	5,081
Recurring | Level 3 | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	587	551
Mortgage loans	382	437
Short-term investments	0
Cash and cash equivalents	0	0
Other invested assets	0	0
Subtotal excluding separate account assets	969	988
Separate account assets, at fair value	0	0
Total assets	969	988
Liabilities:
Insurance liabilities, at fair value	2,233	2,835
Other liabilities	0	0
Separate account liabilities, at fair value	0	0
Total liabilities	2,233	2,835
Recurring | Level 3 | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	18	2
Short-term investments	0	4
Cash and cash equivalents	0	0
Other invested assets	0	0
Deposit asset	404	438
Reinsurance recoverables	151	206
Subtotal excluding separate account assets	573	650
Separate account assets, at fair value	0	0
Total assets	573	650
Liabilities:
Insurance liabilities, at fair value	2,153	2,168
Other liabilities	0	0
Net modified coinsurance payable		78
Separate account liabilities, at fair value	0	0
Total liabilities	2,281	2,246
Recurring | Level 3 | U.S Treasury securities and obligations of U.S. government authorities and agencies
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 3 | U.S Treasury securities and obligations of U.S. government authorities and agencies | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 3 | U.S Treasury securities and obligations of U.S. government authorities and agencies | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 3 | Obligations of U.S. states and their political subdivisions
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 3 | Obligations of U.S. states and their political subdivisions | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 3 | Foreign government bonds
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 3 | Foreign government bonds | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 3 | U.S. corporate public securities
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 3 | U.S. corporate public securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 3 | U.S. corporate public securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 3 | U.S. corporate private securities
Fixed maturity securities
Fixed maturity securities, at fair value	269	245
Recurring | Level 3 | U.S. corporate private securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	267	244
Recurring | Level 3 | U.S. corporate private securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	2	1
Recurring | Level 3 | Foreign corporate public securities
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 3 | Foreign corporate public securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 3 | Foreign corporate public securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 3 | Foreign corporate private securities
Fixed maturity securities
Fixed maturity securities, at fair value	56	57
Recurring | Level 3 | Foreign corporate private securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	56	56
Recurring | Level 3 | Foreign corporate private securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	1
Recurring | Level 3 | Asset-backed securities
Fixed maturity securities
Fixed maturity securities, at fair value	275	246
Recurring | Level 3 | Asset-backed securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	259	246
Recurring | Level 3 | Asset-backed securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	16
Recurring | Level 3 | Commercial mortgage-backed securities
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 3 | Commercial mortgage-backed securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
Recurring | Level 3 | Residential mortgage-backed securities
Fixed maturity securities
Fixed maturity securities, at fair value	5	5
Recurring | Level 3 | Residential mortgage-backed securities | Retained Business
Fixed maturity securities
Fixed maturity securities, at fair value	5	5
Recurring | Level 3 | Residential mortgage-backed securities | Ceded Business
Fixed maturity securities
Fixed maturity securities, at fair value	0	0
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	29	24
Recurring | Fair Value Measured at Net Asset Value Per Share | Fixed Maturities
Liabilities:
Other invested assets excluded from fair value hierarchy	10	8
Recurring | Fair Value Measured at Net Asset Value Per Share | Fixed Maturities | Retained Business
Liabilities:
Other invested assets excluded from fair value hierarchy	10	8
Other | Recurring
Fixed maturity securities
Other invested assets, Netting	(545)	(694)
Subtotal excluding separate account assets	545	694
Other | Recurring | Retained Business
Fixed maturity securities
Other invested assets, Netting	(507)	(638)
Subtotal excluding separate account assets	507	638
Other | Recurring | Ceded Business
Fixed maturity securities
Other invested assets, Netting	(38)	(56)
Subtotal excluding separate account assets	38	56
Other liabilities - derivatives | Recurring
Liabilities:
Liabilities, Netting	(911)	(1,207)
Other liabilities - derivatives | Recurring | Retained Business
Liabilities:
Liabilities, Netting	(873)	(1,151)
Other liabilities - derivatives | Recurring | Ceded Business
Liabilities:
Liabilities, Netting	$ (38)	$ (56)