FAIR VALUE DISCLOSURES - Quantitative Information about Level 3 (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liability for market risk benefits		$ 11,810	$ 14,612
Assets for market risk benefits		863	591
Level 3 \| Discounted cash flow \| Alliance Bernstein
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
AB Contingent consideration payable		$ 9	$ 253
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		0.073	0.046
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		0.293	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		0.055	0.103
Level 3 \| Corporate \| Matrix pricing model
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of fixed maturities AFS		$ 402	$ 373
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		0.0070	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		0.0220	0.0747
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		0.0153	0.0181
Level 3 \| Corporate \| Market comparable companies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of fixed maturities AFS		$ 981	$ 979
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		4.7	3.3
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		36.5	29.0
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		12.2	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		0.084	0.000
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		0.349	0.228
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	0.039
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		1.8	0.8
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		11.8	10.0
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		4.5	6.3
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		0.000	0.034
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		0.564	0.610
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		0.150	0.138
Level 3 \| Trading Securities, at Fair Value \| Market comparable companies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of fixed maturities AFS		$ 1
Level 3 \| Trading Securities, at Fair Value \| Market comparable companies \| Cash Flow Multiples \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		8.4
Level 3 \| Trading Securities, at Fair Value \| Market comparable companies \| Cash Flow Multiples \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		8.4
Level 3 \| Trading Securities, at Fair Value \| Market comparable companies \| Cash Flow Multiples \| Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage measurement input of equity securities		8.4
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		$ 75	$ 61
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		8.6	9.1
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 \| 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		$ 7,376	$ 9,427
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		0.0024	0.0021
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		0.1305	0.1238
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		0.0217	0.0179
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		0.0006	0.0007
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		0.1165	0.1497
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		0.0048	0.0046
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		0.6670	0.6621
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		0.0675	0.0744
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		0.0033	0.0035
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		0.0093	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]
Percentage measurement input of equity securities		0.0034	0.0045
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		0.12	0.11
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		0.29	0.28
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	0.23
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		0.0017	0.0018
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		0.0336	0.0307
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		0.0006	0.0007
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		0.0052	0.0053
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		0.0032	0.0033
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		0.4120	0.4200
Level 3 \| Direct MRB \| Discounted cash flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Direct MRB		$ 10,947	$ 14,021
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		0.0024	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 servicing liability		0.3618	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 servicing liability		0.0357	0.0307
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		0.1165	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 servicing liability		0.0058	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 servicing liability		0.0094	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 servicing liability		0.0094	0.0118
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		0.0017	0.0018
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		0.0300	0.0250
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		0.0006	0.0007
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		0.0052	0.0053
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		0.0032	0.0033
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		0.4120	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 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		0.0515	0.0538