FAIR VALUE DISCLOSURES - Quantitative Information About Level 3 (Details) $ in Millions	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liability for market risk benefits	$ 12,791	$ 14,570
Assets for market risk benefits	784	574
Level 3 | Corporate | Matrix pricing model
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of fixed maturities AFS	$ 308	$ 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	0.0020	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	0.0146	0.0187
Level 3 | Corporate | Market  comparable  companies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of fixed maturities AFS	$ 1,156	$ 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	3.3	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	30.5	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	13.5	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	0.192	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	0.038	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	0.8	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	9.3	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	6.2	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	0.000	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	0.614	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	0.140	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	$ 2	$ 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	3.9	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	7.0	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	5.9	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	$ 14,689	$ 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	0.0284	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	0.0058	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	0.0524	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	0.0022	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	0.0032	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	0.12	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	0.28	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	0.23	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	0.0299	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	$ 12,007	$ 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	0.0317	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	0.0067	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	0.0117	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	0.0117	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	0.0279	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	0.0522	0.0544