FAIR VALUE DISCLOSURES - Quantitative Information about Level 3 (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jul. 01, 2022 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liability for market risk benefits		$ 14,612	$ 15,766
Assets for market risk benefits		591	490
Alliance Bernstein
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
AB Contingent consideration payable				$ 229
Level 3 \| Discounted cash flow \| Alliance Bernstein
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
AB Contingent consideration payable		$ 253	$ 247
Level 3 \| Discounted cash flow \| Discount Rate \| Minimum \| Alliance Bernstein
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Expected revenue growth and discount rate		0.019	0.019
Level 3 \| Discounted cash flow \| Discount Rate \| Maximum \| Alliance Bernstein
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Expected revenue growth and discount rate		0.104	0.104
Level 3 \| Discounted cash flow \| Discount Rate \| Weighted Average \| Alliance Bernstein
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Expected revenue growth and discount rate		0.046	0.045
Level 3 \| Discounted cash flow \| Expected Revenue Growth Rate \| Minimum \| Alliance Bernstein
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Expected revenue growth and discount rate		0.020	0.020
Level 3 \| Discounted cash flow \| Expected Revenue Growth Rate \| Maximum \| Alliance Bernstein
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Expected revenue growth and discount rate		0.839	0.839
Level 3 \| Discounted cash flow \| Expected Revenue Growth Rate \| Weighted Average \| Alliance Bernstein
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Expected revenue growth and discount rate		0.103	0.115
Level 3 \| Corporate \| Matrix pricing model
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of fixed maturities AFS		$ 373	$ 417
Level 3 \| Corporate \| Matrix pricing model \| Spread over Benchmark \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.0020	0.0020
Level 3 \| Corporate \| Matrix pricing model \| Spread over Benchmark \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.0747	0.0797
Level 3 \| Corporate \| Matrix pricing model \| Spread over Benchmark \| Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.0181	0.0205
Level 3 \| Corporate \| Market comparable companies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of fixed maturities AFS		$ 979	$ 1,029
Level 3 \| Corporate \| Market comparable companies \| EBITDA Multiples \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		3.3	5.3
Level 3 \| Corporate \| Market comparable companies \| EBITDA Multiples \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		29.0	35.8
Level 3 \| Corporate \| Market comparable companies \| EBITDA Multiples \| Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		13.6	13.6
Level 3 \| Corporate \| Market comparable companies \| Discount Rate \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.000	0.090
Level 3 \| Corporate \| Market comparable companies \| Discount Rate \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.228	0.457
Level 3 \| Corporate \| Market comparable companies \| Discount Rate \| Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.039	0.119
Level 3 \| Corporate \| Market comparable companies \| Cash Flow Multiples \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.8	0.0
Level 3 \| Corporate \| Market comparable companies \| Cash Flow Multiples \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		10.0	10.3
Level 3 \| Corporate \| Market comparable companies \| Cash Flow Multiples \| Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		6.3	6.1
Level 3 \| Corporate \| Market comparable companies \| Loan to Value \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.034	0.000
Level 3 \| Corporate \| Market comparable companies \| Loan to Value \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.610	0.404
Level 3 \| Corporate \| Market comparable companies \| Loan to Value \| Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.138	0.120
Level 3 \| Trading Securities, at Fair Value \| Discounted cash flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of fixed maturities AFS		$ 61	$ 55
Discount years	7 years	7 years
Level 3 \| Trading Securities, at Fair Value \| Discounted cash flow \| Earnings/Revenue Multiple
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		9.1	8.3
Level 3 \| Trading Securities, at Fair Value \| Discounted cash flow \| Discount Factor
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.100	0.1000
Level 3 \| Other equity investments \| Market comparable companies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of fixed maturities AFS			$ 4
Level 3 \| Other equity investments \| Market comparable companies \| Earnings/Revenue Multiple \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities			0.5
Level 3 \| Other equity investments \| Market comparable companies \| Earnings/Revenue Multiple \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities			10.8
Level 3 \| Other equity investments \| Market comparable companies \| Earnings/Revenue Multiple \| Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities			2.4
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
Level 3 \| Other equity investments \| Discounted cash flow \| Earnings/Revenue Multiple \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		3.9
Level 3 \| Other equity investments \| Discounted cash flow \| Earnings/Revenue Multiple \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		8.4
Level 3 \| Other equity investments \| Discounted cash flow \| Earnings/Revenue Multiple \| Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		6.5
Level 3 \| Purchased MRB asset \| Discounted cash flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of fixed maturities AFS		$ 9,427	$ 10,423
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Lapse Rate \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.0021	0.0026
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Lapse Rate \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.1238	0.2623
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Lapse Rate \| Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.0179	0.0158
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Withdrawal Rate \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.0007	0.0006
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Withdrawal Rate \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.1497	0.1093
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Withdrawal Rate \| Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.0046	0.0069
Level 3 \| Purchased MRB asset \| Discounted cash flow \| GMIB Utilization Rate \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		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]
Percentage measurement input of equity securities		0.6621	0.6666
Level 3 \| Purchased MRB asset \| Discounted cash flow \| GMIB Utilization Rate \| Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.0744	0.0739
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Non-Performance Risk \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.0035	0.0054
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Non-Performance Risk \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.0097	0.0124
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Non-Performance Risk \| Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.0045	0.0069
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Volatility Rate - Equity \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.11	0.14
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Volatility Rate - Equity \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.28	0.32
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Volatility Rate - Equity \| Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.23	0.24
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Mortality \| Ages 0 - 40 \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.0001	0.0001
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Mortality \| Ages 0 - 40 \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.0018	0.0017
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Mortality \| Ages 0 - 40 \| Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.0307	0.0287
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Mortality \| Ages 41 - 60 \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.0007	0.0006
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Mortality \| Ages 41 - 60 \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.0053	0.0052
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Mortality \| Ages 61 - 115 \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.0033	0.0032
Level 3 \| Purchased MRB asset \| Discounted cash flow \| Mortality \| Ages 61 - 115 \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		0.4200	0.4000
Level 3 \| Direct MRB \| Discounted cash flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Direct MRB		$ 14,021	$ 15,276
Level 3 \| Direct MRB \| Discounted cash flow \| Lapse Rate \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of servicing liability		0.0021	0.0026
Level 3 \| Direct MRB \| Discounted cash flow \| Lapse Rate \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of servicing liability		0.2937	0.3542
Level 3 \| Direct MRB \| Discounted cash flow \| Lapse Rate \| Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of servicing liability		0.0307	0.0301
Level 3 \| Direct MRB \| Discounted cash flow \| Withdrawal Rate \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of servicing liability		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 servicing liability		0.1497	0.1093
Level 3 \| Direct MRB \| Discounted cash flow \| Withdrawal Rate \| Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of servicing liability		0.0064	0.0068
Level 3 \| Direct MRB \| Discounted cash flow \| Non-Performance Risk
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of servicing liability		118	0.0157
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 servicing liability		118	0.0157
Level 3 \| Direct MRB \| Discounted cash flow \| Mortality \| Ages 0 - 40 \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of servicing liability		0.0001	0.0001
Level 3 \| Direct MRB \| Discounted cash flow \| Mortality \| Ages 0 - 40 \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of servicing liability		0.0018	0.0017
Level 3 \| Direct MRB \| Discounted cash flow \| Mortality \| Ages 0 - 40 \| Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of servicing liability		0.0250	0.0243
Level 3 \| Direct MRB \| Discounted cash flow \| Mortality \| Ages 41 - 60 \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of servicing liability		0.0007	0.0006
Level 3 \| Direct MRB \| Discounted cash flow \| Mortality \| Ages 41 - 60 \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of servicing liability		0.0053	0.0052
Level 3 \| Direct MRB \| Discounted cash flow \| Mortality \| Ages 61 - 115 \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of servicing liability		0.0033	0.0032
Level 3 \| Direct MRB \| Discounted cash flow \| Mortality \| Ages 61 - 115 \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of servicing liability		0.4200	0.4000
Level 3 \| Direct MRB \| Discounted cash flow \| Annuitization Rate \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input of servicing liability		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 servicing liability		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 servicing liability		0.0538	0.0553