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FAIR VALUE DISCLOSURES - Quantitative Information about Level 3 (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liability for market risk benefits $ 10,301 $ 11,810
Assets for market risk benefits 762 863
Level 3 | Discounted cash flow | Alliance Bernstein    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
AB Contingent consideration payable $ 9 $ 9
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 0.019 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 0.019 0.073
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 0.133 0.293
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 0.068 0.055
Level 3 | Corporate | Matrix pricing model    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of fixed maturities AFS   $ 402
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
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
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
Level 3 | Corporate | Market comparable  companies    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of fixed maturities AFS $ 1,184 $ 981
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 4.9 4.7
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 35.0 36.5
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 13.4 12.2
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 0.078 0.084
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 0.197 0.349
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 0.042 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 2.3 1.8
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 18.5 11.8
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 6.4 4.5
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 0.032 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 0.525 0.564
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 0.122 0.150
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 $ 81 $ 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 8.5 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 31.3 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 15.4 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 $ 75
Discount 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 8.6
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 0.100
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 4.3  
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 14.5  
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 7.8  
Level 3 | Purchased MRB asset | Discounted cash flow    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of fixed maturities AFS $ 5,415 $ 7,376
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 0.0004 0.0024
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 0.1367 0.1305
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 0.0232 0.0217
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 0.0012 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 0.0651 0.1165
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 0.0063 0.0048
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 0.6369 0.6670
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 0.0683 0.0675
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 0.0005 0.0033
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 0.0086 0.0093
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 0.0008 0.0034
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 0.13 0.12
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 0.31 0.29
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 0.0017
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 0.0338 0.0336
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 0.0006
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 0.0051 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 0.0031 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 0.4040 0.4120
Level 3 | Direct MRB | Discounted cash flow    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Direct MRB $ 9,539 $ 10,947
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 0.0004 0.0024
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 0.3809 0.3618
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 0.0407 0.0357
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 0.0800 0.1165
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 0.0075 0.0058
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 0.0081 0.0094
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 0.0081 0.0094
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 0.0017
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 0.0293 0.0300
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 0.0006
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 0.0051 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 0.0031 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 0.4040 0.4120
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 0.0522 0.0515