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FAIR VALUE DISCLOSURES - QUANTITATIVE INFORMATION ABOUT LEVEL 3 (Details) - Level 3
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
Corporate | Matrix pricing model      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Assets, fair value $ 31 $ 53  
Corporate | Market com-parable companies      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Assets, fair value $ 757 $ 789  
Corporate | Minimum | Matrix pricing model      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Spread over the industry-specific benchmark yield curve 0.0075 0  
Corporate | Maximum | Matrix pricing model      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Spread over the industry-specific benchmark yield curve 0.0565 565  
Corporate | Weighted Average | Matrix pricing model      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Spread over the industry-specific benchmark yield curve 0.0188 125  
Separate Account assets | Third party appraisal      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Assets, fair value $ 339 $ 326  
Separate Account assets | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Assets, fair value $ 1 $ 1  
Spread over the industry-specific benchmark yield curve 0.0228 243  
GMIB reinsurance contracts | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Assets, fair value $ 1,825 $ 10,488  
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 0.0005 0.0005  
GMIB reinsurance contracts | Maximum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing asset, measurement input 0.063    
Servicing asset, non-performance risk 0.0010 0.0010  
GMIBNLG | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Liabilities, fair value $ 3,419 $ 4,056  
Servicing liability, non-performance liability 0.010 0.010  
GWBL/GMWB | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Liabilities, fair value $ 119 $ 130  
GIB | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Liabilities, fair value (41) (27)  
GMAB | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Liabilities, fair value $ 3 5  
AB 2016 Acquisition | Alliance Bernstein      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Contingent payment arrangements   $ 11 $ 11
Withdrawal rate | 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 | 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 | GMIBNLG | Minimum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.000 0.000  
Withdrawal rate | GMIBNLG | Maximum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.124 0.124  
Withdrawal rate | 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 | 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 | GIB | Minimum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.00 0.000  
Withdrawal rate | GIB | Maximum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.07 0.070  
EBITDA multiple | Corporate | Minimum | Market com-parable companies      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Equity security, measurement input 4.8 5.3  
EBITDA multiple | Corporate | Maximum | Market com-parable companies      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Equity security, measurement input 33.0 27.9  
EBITDA multiple | Corporate | Weighted Average | Market com-parable companies      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Equity security, measurement input 13.0 12.9  
Long-term revenue growth rate | AB 2016 Acquisition | Alliance Bernstein      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Acquisition-related contingent consideration liability, measurement input   0.310 0.310
Discount rate | Corporate | Minimum | Market com-parable companies      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Equity security, measurement input 0.072 0.072  
Discount rate | Corporate | Maximum | Market com-parable companies      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Equity security, measurement input 0.170 0.170  
Discount rate | Corporate | Weighted Average | Market com-parable companies      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Equity security, measurement input 0.111 0.111  
Discount rate | Separate Account assets | Third party appraisal      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing asset, measurement input 0.065 0.066  
Discount rate | Separate Account assets | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing asset, measurement input 0.048 0.04409  
Discount rate | AB 2016 Acquisition | Alliance Bernstein | Minimum      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Acquisition-related contingent consideration liability, measurement input   0.014 0.014
Discount rate | AB 2016 Acquisition | Alliance Bernstein | Maximum      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Acquisition-related contingent consideration liability, measurement input   0.023 0.023
Cash flow multiples | Corporate | Minimum | Market com-parable companies      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Equity security, measurement input 9.0 9.0  
Cash flow multiples | Corporate | Maximum | Market com-parable companies      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Equity security, measurement input 17.7 17.7  
Cash flow multiples | Corporate | Weighted Average | Market com-parable companies      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Equity security, measurement input 13.1 13.1  
Cap rate | Separate Account assets | Third party appraisal      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing asset, measurement input 0.045 0.046  
Exit capitalization rate | Separate Account assets | Third party appraisal      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing asset, measurement input 0.056 0.056  
Utilization rate | GMIB reinsurance contracts | Minimum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing asset, measurement input 0.00 0.000  
Utilization rate | GMIB reinsurance contracts | Maximum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing asset, measurement input 0.16 0.160  
Utilization rate | GMIBNLG | Minimum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.000 0.000  
Utilization rate | GMIBNLG | Maximum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.160 0.160  
Utilization rate | GWBL/GMWB | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 1.00 1.00  
Utilization rate | GIB | Minimum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.00 0.000  
Utilization rate | GIB | Maximum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.16 0.160  
Equity volatility | GMIB reinsurance contracts | Minimum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing asset, measurement input 0.09 0.099  
Equity volatility | GMIB reinsurance contracts | Maximum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing asset, measurement input 0.32 0.309  
Equity volatility | GMIBNLG | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.200 0.200  
Equity volatility | GMIBNLG | Minimum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.008 0.008  
Equity volatility | GMIBNLG | Maximum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.262 0.262  
Equity volatility | GWBL/GMWB | Minimum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.09 0.099  
Equity volatility | GWBL/GMWB | Maximum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.32 0.309  
Equity volatility | GIB | Minimum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.09 0.099  
Equity volatility | GIB | Maximum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.32 0.309  
Equity volatility | GMAB | Minimum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.09 0.099  
Equity volatility | GMAB | Maximum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.32 0.309  
Forfeiture rate | GMIBNLG | Minimum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.0055 0.0055  
Forfeiture rate | GMIBNLG | Maximum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.021 0.021  
Lapse rate | GMIB reinsurance contracts | Minimum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing asset, measurement input   0.010  
Lapse rate | GMIB reinsurance contracts | Maximum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing asset, measurement input   0.063  
Lapse rate | GWBL/GMWB | Minimum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.005 0.009  
Lapse rate | 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 | GIB | Minimum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.005 0.009  
Lapse rate | GIB | Maximum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.057 0.057  
Lapse rate | GMAB | Minimum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.005 0.005  
Lapse rate | GMAB | Maximum | Discounted cash flow      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Servicing liability, measurement input 0.110 0.110