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FAIR VALUE DISCLOSURES - Quantative Information About Level 3 (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Investment Gains (Losses), Net $ (8,000,000) $ 87,000,000    
Level 3 | Corporate | Matrix pricing model        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Assets, fair value 96,000,000   $ 93,000,000  
Level 3 | Corporate | Market comparable companies        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Assets, fair value $ 891,000,000   881,000,000  
Level 3 | Corporate | Minimum | Matrix pricing model        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Spread over benchmark 0.0015      
Level 3 | Corporate | Maximum | Matrix pricing model        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Spread over benchmark 0.0580      
Level 3 | Corporate | Weighted Average | Matrix pricing model        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Spread over benchmark 0.0109      
Level 3 | Separate Accounts assets | Third party appraisal        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Assets, fair value $ 359,000,000   352,000,000  
Level 3 | Separate Accounts assets | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Assets, fair value $ 1,000,000   $ 1,000,000  
Spread over benchmark 0.0248   0.0248  
Level 3 | GMIB reinsurance contracts | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Assets, fair value $ 2,009,000,000   $ 1,991,000,000  
Level 3 | GMIB reinsurance contracts | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input 0.01      
Servicing asset, non-performance risk 0.0052   0.0074  
Level 3 | GMIB reinsurance contracts | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input 0.0627      
Servicing asset, non-performance risk 0.0129   0.0159  
Level 3 | GMIBNLG | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, non-performance liability 0.010   0.019  
Withdrawal rate | Level 3 | GMIB reinsurance contracts | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input 0.000   0.000  
Withdrawal rate | Level 3 | GMIB reinsurance contracts | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input 0.080   0.080  
Withdrawal rate | Level 3 | GMIBNLG | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.000   0.000  
Withdrawal rate | Level 3 | GMIBNLG | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.12144   0.121  
Withdrawal rate | Level 3 | GWBL/GMWB | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.000   0.000  
Withdrawal rate | Level 3 | GWBL/GMWB | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.070   0.070  
Withdrawal rate | Level 3 | GIB | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0   0.000  
Withdrawal rate | Level 3 | GIB | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.080   0.080  
EBITDA multiple | Level 3 | Corporate | Minimum | Market comparable companies        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Equity security, measurement input 3.9   4.1  
EBITDA multiple | Level 3 | Corporate | Maximum | Market comparable companies        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Equity security, measurement input 25.5   37.8  
EBITDA multiple | Level 3 | Corporate | Weighted Average | Market comparable companies        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Equity security, measurement input 12.7   12.1  
Discount rate | Level 3 | Corporate | Minimum | Market comparable companies        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Equity security, measurement input 0.061   0.064  
Discount rate | Level 3 | Corporate | Maximum | Market comparable companies        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Equity security, measurement input 0.165   0.165  
Discount rate | Level 3 | Corporate | Weighted Average | Market comparable companies        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Equity security, measurement input 0.106   0.107  
Discount rate | Level 3 | Separate Accounts assets | Third party appraisal        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input 0.064   0.065  
Discount rate | Level 3 | Separate Accounts assets | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input 0.048   0.051  
Cash flow multiples | Level 3 | Corporate | Minimum | Market comparable companies        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Equity security, measurement input 1.6   1.8  
Cash flow multiples | Level 3 | Corporate | Maximum | Market comparable companies        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Equity security, measurement input 18.0   18.0  
Cash flow multiples | Level 3 | Corporate | Weighted Average | Market comparable companies        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Equity security, measurement input 11.4   11.4  
Cap rate | Level 3 | Separate Accounts assets | Third party appraisal        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input 0.044   0.044  
Exit capitalization rate | Level 3 | Separate Accounts assets | Third party appraisal        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input 0.055   0.056  
Utilization rate | Level 3 | GMIB reinsurance contracts | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input 0   0.000  
Utilization rate | Level 3 | GMIB reinsurance contracts | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input 0.160   0.160  
Utilization rate | Level 3 | GMIBNLG | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.000   0.000  
Utilization rate | Level 3 | GMIBNLG | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.160   1.000  
Utilization rate | Level 3 | GWBL/GMWB | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 1.00   1.00  
Utilization rate | Level 3 | GIB | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0   0.000  
Utilization rate | Level 3 | GIB | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.160   0.160  
Equity volatility | Level 3 | GMIB reinsurance contracts | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input 0.070   0.100  
Equity volatility | Level 3 | GMIB reinsurance contracts | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input 0.320   0.340  
Equity volatility | Level 3 | GMIBNLG | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.200      
Equity volatility | Level 3 | GMIBNLG | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.008   0.008  
Equity volatility | Level 3 | GMIBNLG | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.262   0.262  
Equity volatility | Level 3 | GWBL/GMWB | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.070   0.100  
Equity volatility | Level 3 | GWBL/GMWB | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.320   0.340  
Equity volatility | Level 3 | GIB | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.070   0.100  
Equity volatility | Level 3 | GIB | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.320   0.340  
Equity volatility | Level 3 | GMAB | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.070   0.100  
Equity volatility | Level 3 | GMAB | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.320   0.340  
Forfeiture rate | Level 3 | GMIBNLG | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.0055      
Forfeiture rate | Level 3 | GMIBNLG | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.021      
Lapse rate | Level 3 | GMIB reinsurance contracts | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input     0.010  
Lapse rate | Level 3 | GMIB reinsurance contracts | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input     0.0627  
Lapse rate | Level 3 | GWBL/GMWB | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.005   0.005  
Lapse rate | Level 3 | GWBL/GMWB | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.057   0.057  
Lapse rate | Level 3 | GIB | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.005   0.005  
Lapse rate | Level 3 | GIB | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.057   0.057  
Lapse rate | Level 3 | GMAB | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.005   0.010  
Lapse rate | Level 3 | GMAB | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.110   0.057  
Age 0-40 | Mortality Rate | Level 3 | GMIB reinsurance contracts | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input 0.0001   0.0001  
Age 0-40 | Mortality Rate | Level 3 | GMIB reinsurance contracts | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input 0.0018   0.0018  
Age 0-40 | Mortality Rate | Level 3 | GMIBNLG | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.0001   0.0001  
Age 0-40 | Mortality Rate | Level 3 | GMIBNLG | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.0019   0.0019  
Age 41-60 | Mortality Rate | Level 3 | GMIB reinsurance contracts | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input 0.0007   0.0007  
Age 41-60 | Mortality Rate | Level 3 | GMIB reinsurance contracts | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input 0.0054   0.0054  
Age 41-60 | Mortality Rate | Level 3 | GMIBNLG | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.0006   0.0006  
Age 41-60 | Mortality Rate | Level 3 | GMIBNLG | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.0053   0.0053  
Age 61-115 | Mortality Rate | Level 3 | GMIB reinsurance contracts | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input 0.0042   0.0042  
Age 61-115 | Mortality Rate | Level 3 | GMIB reinsurance contracts | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing asset, measurement input 0.420   0.420  
Age 61-115 | Mortality Rate | Level 3 | GMIBNLG | Minimum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.0041   0.0041  
Age 61-115 | Mortality Rate | Level 3 | GMIBNLG | Maximum | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Servicing liability, measurement input 0.412   0.412  
GIB | Level 3 | GIB | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Embedded Derivative, Fair Value of Embedded Derivative Liability $ (44)   $ (48,000,000)  
GMIBNLG | Level 3 | GMIBNLG | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Embedded Derivative, Fair Value of Embedded Derivative Liability 5,847   5,341,000,000  
GMxB derivative features liability | Level 3        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Net Derivative Gains (Losses) 0      
Assets, fair value     (5,431,000,000)  
Separate Accounts assets | Level 3        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Net Derivative Gains (Losses) 7,000,000 7,000,000    
Assets, fair value 383,000,000 357,000,000 374,000,000 $ 349,000,000
State and Political Sub-divisions | Level 3        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
OCI 1,000,000 (1,000,000)    
Assets, fair value 39,000,000 39,000,000 38,000,000 40,000,000
Corporate | Level 3        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
OCI 9,000,000 (20,000,000)    
Assets, fair value 1,169,000,000 1,229,000,000 1,174,000,000 1,139,000,000
GMIB reinsurance contracts | Level 3        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Net Derivative Gains (Losses) 0 0    
Assets, fair value 2,009,000,000 9,674,000,000 1,991,000,000 $ 10,488,000,000
GWBL/GMWB | Level 3 | GWBL/GMWB | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Embedded Derivative, Fair Value of Embedded Derivative Liability 137   130,000,000  
GMAB | Level 3 | GMAB | Discounted cash flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Embedded Derivative, Fair Value of Embedded Derivative Liability 4   $ 7,000,000  
Continuing Operations | GMxB derivative features liability | Level 3        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Investment Gains (Losses), Net 0 0    
Net Derivative Gains (Losses) (409,000,000) 440,000,000    
OCI 0 0    
Continuing Operations | Separate Accounts assets | Level 3        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Investment Gains (Losses), Net 7,000,000 7,000,000    
Net Derivative Gains (Losses) 0 0    
OCI 0 0    
Continuing Operations | State and Political Sub-divisions | Level 3        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Investment Gains (Losses), Net 0 0    
Net Derivative Gains (Losses) 0 0    
OCI 1,000,000 (1,000,000)    
Continuing Operations | Corporate | Level 3        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Investment Gains (Losses), Net 0 0    
Net Derivative Gains (Losses) 0 0    
OCI 9,000,000 (19,000,000)    
Continuing Operations | Subtotal | Level 3        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Investment Gains (Losses), Net 0 0    
Net Derivative Gains (Losses) 0 0    
OCI 14,000,000 (20,000,000)    
Continuing Operations | GMIB reinsurance contracts | Level 3        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Investment Gains (Losses), Net 0 0    
Net Derivative Gains (Losses) 27,000,000 (842,000,000)    
OCI 0 0    
Continuing Operations | Total | Level 3        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Investment Gains (Losses), Net 7,000,000 7,000,000    
Net Derivative Gains (Losses) (382,000,000) (402,000,000)    
OCI $ 14,000,000 $ (20,000,000)