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FAIR VALUE DISCLOSURES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Fair value adjustments on GMIB asset $ 381   $ 110
Fair value adjustments on GMIB liability 74   25
AFS fixed maturities transferred from Level 3 to Level 2 126 $ 69  
AFS fixed maturities transferred from Level 3 to Level 2 $ 0 $ 17  
Fair value measurement with unobservable inputs reconciliation recurring basis asset transfers percentage 0.60% 0.60%  
Nonrecurring | Level 3      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Investments, fair value disclosure $ 267   428
Fair Value, Measurements, Recurring      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Separate Accounts assets 105,485   126,324
Business combination, contingent consideration, liability 24   23
Fair Value, Measurements, Recurring | Level 3      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Separate Accounts assets 0   0
Business combination, contingent consideration, liability 24   $ 23
AB 2019 Acquisition | Level 3 | Alliance Bernstein | Long-term revenue growth rate | Minimum      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Contingent payment arrangement, measurement input     0.70%
AB 2019 Acquisition | Level 3 | Alliance Bernstein | Long-term revenue growth rate | Maximum      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Contingent payment arrangement, measurement input     2.50%
AB 2019 Acquisition | Level 3 | Alliance Bernstein | Discount rate | Minimum      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Contingent payment arrangement, measurement input     10.40%
AB 2019 Acquisition | Level 3 | Alliance Bernstein | Risk Free Interest Rate | Minimum      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Contingent payment arrangement, measurement input     3.50%
AB 2019 Acquisition | Level 3 | Alliance Bernstein | Market price risk adjustment rate | Minimum      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Contingent payment arrangement, measurement input     6.90%
AB 2016 Acquisition | Level 3 | Alliance Bernstein      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Business combination, contingent consideration, liability 24   $ 23
AB 2016 Acquisition | Level 3 | Alliance Bernstein | Long-term revenue growth rate      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Contingent payment arrangement, measurement input     50.00%
AB 2016 Acquisition | Level 3 | Alliance Bernstein | Discount rate      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Contingent payment arrangement, measurement input     3.00%
Contingent Payment Arrangement | Level 3      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
AFS fixed maturities transferred from Level 3 to Level 2 0 $ 0  
AFS fixed maturities transferred from Level 3 to Level 2 0 0  
Purchases 0 0  
Change in estimate $ 0 $ 0  
Contingent Payment Arrangement | Level 3 | Alliance Bernstein      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Purchases     $ 17
Change in estimate     $ 3