FAIR VALUE DISCLOSURES - Quantitative Information About Level 3 (Details) $ in Millions	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liability for market risk benefits	$ 12,568	$ 14,570
Assets for market risk benefits	763	574
Level 3 | Corporate | Matrix pricing model
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of fixed maturities AFS	$ 311	$ 330
Level 3 | Corporate | Matrix pricing model | Spread over benchmark | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0045	0.0020
Level 3 | Corporate | Matrix pricing model | Spread over benchmark | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0220	0.0747
Level 3 | Corporate | Matrix pricing model | Spread over benchmark | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0139	0.0187
Level 3 | Corporate | Market  comparable  companies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of fixed maturities AFS	$ 699	$ 979
Level 3 | Corporate | Market  comparable  companies | EBITDA Multiple | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	4.0	3.3
Level 3 | Corporate | Market  comparable  companies | EBITDA Multiple | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	33.0	29.0
Level 3 | Corporate | Market  comparable  companies | EBITDA Multiple | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	12.7	13.6
Level 3 | Corporate | Market  comparable  companies | Discount Rate | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.000	0.000
Level 3 | Corporate | Market  comparable  companies | Discount Rate | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.289	0.228
Level 3 | Corporate | Market  comparable  companies | Discount Rate | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.052	0.039
Level 3 | Corporate | Market  comparable  companies | Cash Flow Multiples | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0	0.8
Level 3 | Corporate | Market  comparable  companies | Cash Flow Multiples | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	9.0	10.0
Level 3 | Corporate | Market  comparable  companies | Cash Flow Multiples | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	5.8	6.3
Level 3 | Corporate | Market  comparable  companies | Loan to Value | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.096	0.034
Level 3 | Corporate | Market  comparable  companies | Loan to Value | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.128	0.610
Level 3 | Corporate | Market  comparable  companies | Loan to Value | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.050	0.138
Level 3 | Other equity investments | Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of fixed maturities AFS	$ 0	$ 2
Level 3 | Other equity investments | Discounted Cash Flow | Earnings multiple | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	6.9	6.5
Level 3 | Other equity investments | Discounted Cash Flow | Earnings multiple | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0	6.2
Level 3 | Other equity investments | Discounted Cash Flow | Earnings multiple | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0	6.0
Level 3 | Purchased MRB asset | Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of fixed maturities AFS	$ 14,185	$ 16,729
Level 3 | Purchased MRB asset | Discounted Cash Flow | Lapse Rate | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0021	0.0021
Level 3 | Purchased MRB asset | Discounted Cash Flow | Lapse Rate | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.2937	0.2937
Level 3 | Purchased MRB asset | Discounted Cash Flow | Lapse Rate | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0286	0.0275
Level 3 | Purchased MRB asset | Discounted Cash Flow | Withdrawal Rate | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0000	0.0000
Level 3 | Purchased MRB asset | Discounted Cash Flow | Withdrawal Rate | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.1497	0.1497
Level 3 | Purchased MRB asset | Discounted Cash Flow | Withdrawal Rate | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0063	0.0055
Level 3 | Purchased MRB asset | Discounted Cash Flow | GMIB Utilization Rate | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0004	0.0004
Level 3 | Purchased MRB asset | Discounted Cash Flow | GMIB Utilization Rate | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	1.0000	1.0000
Level 3 | Purchased MRB asset | Discounted Cash Flow | GMIB Utilization Rate | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0519	0.0551
Level 3 | Purchased MRB asset | Discounted Cash Flow | Non-performance Risk | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0021	0.0023
Level 3 | Purchased MRB asset | Discounted Cash Flow | Non-performance Risk | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0101	0.0097
Level 3 | Purchased MRB asset | Discounted Cash Flow | Non-performance Risk | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0033	0.0035
Level 3 | Purchased MRB asset | Discounted Cash Flow | Volatility rates - Equity | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.11	0.11
Level 3 | Purchased MRB asset | Discounted Cash Flow | Volatility rates - Equity | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.31	0.28
Level 3 | Purchased MRB asset | Discounted Cash Flow | Volatility rates - Equity | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.24	0.23
Level 3 | Purchased MRB asset | Discounted Cash Flow | Mortality Rates | Age 0-40 | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0001	0.0001
Level 3 | Purchased MRB asset | Discounted Cash Flow | Mortality Rates | Age 0-40 | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0018	0.0018
Level 3 | Purchased MRB asset | Discounted Cash Flow | Mortality Rates | Age 0-40 | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0295	0.0287
Level 3 | Purchased MRB asset | Discounted Cash Flow | Mortality Rates | Age 41-60 | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0007	0.0007
Level 3 | Purchased MRB asset | Discounted Cash Flow | Mortality Rates | Age 41-60 | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0053	0.0053
Level 3 | Purchased MRB asset | Discounted Cash Flow | Mortality Rates | Ages 61 - 115 | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.0033	0.0033
Level 3 | Purchased MRB asset | Discounted Cash Flow | Mortality Rates | Ages 61 - 115 | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of fixed maturities AFS	0.4200	0.4200
Level 3 | Direct MRB | Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Direct MRB	$ 11,805	$ 13,996
Level 3 | Direct MRB | Discounted Cash Flow | Lapse Rate | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of direct MRB	0.0021	0.0021
Level 3 | Direct MRB | Discounted Cash Flow | Lapse Rate | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of direct MRB	0.2937	0.2937
Level 3 | Direct MRB | Discounted Cash Flow | Lapse Rate | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of direct MRB	0.0318	0.0303
Level 3 | Direct MRB | Discounted Cash Flow | Withdrawal Rate | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of direct MRB	0.0000	0.0000
Level 3 | Direct MRB | Discounted Cash Flow | Withdrawal Rate | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of direct MRB	0.1497	0.1497
Level 3 | Direct MRB | Discounted Cash Flow | Withdrawal Rate | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of direct MRB	0.0073	0.0064
Level 3 | Direct MRB | Discounted Cash Flow | Non-performance Risk
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of direct MRB	0.0109	0.0118
Level 3 | Direct MRB | Discounted Cash Flow | Non-performance Risk | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of direct MRB	0.0109	0.0118
Level 3 | Direct MRB | Discounted Cash Flow | Mortality Rates | Age 0-40 | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of direct MRB	0.0001	0.0001
Level 3 | Direct MRB | Discounted Cash Flow | Mortality Rates | Age 0-40 | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of direct MRB	0.0018	0.0018
Level 3 | Direct MRB | Discounted Cash Flow | Mortality Rates | Age 0-40 | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of direct MRB	0.0284	0.0263
Level 3 | Direct MRB | Discounted Cash Flow | Mortality Rates | Age 41-60 | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of direct MRB	0.0007	0.0007
Level 3 | Direct MRB | Discounted Cash Flow | Mortality Rates | Age 41-60 | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of direct MRB	0.0053	0.0053
Level 3 | Direct MRB | Discounted Cash Flow | Mortality Rates | Ages 61 - 115 | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of direct MRB	0.0033	0.0033
Level 3 | Direct MRB | Discounted Cash Flow | Mortality Rates | Ages 61 - 115 | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of direct MRB	0.4200	0.4200
Level 3 | Direct MRB | Discounted Cash Flow | Annuitization Rate | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of direct MRB	0.0004	0.0004
Level 3 | Direct MRB | Discounted Cash Flow | Annuitization Rate | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of direct MRB	1.0000	1.0000
Level 3 | Direct MRB | Discounted Cash Flow | Annuitization Rate | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of direct MRB	0.0526	0.0544