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FAIR VALUE DISCLOSURES - QUANTITATIVE INFORMATION ABOUT LEVEL 3 (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Corporate | Minimum | Matrix pricing model    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Spread over the industry-specific benchmark yield curve 0.0000 0.0000
Corporate | Minimum | Market com-parable companies    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
EBITDA multiples 6.2 5.3
Discount rate 7.20% 7.20%
Cash flow multiples 9.0 9.0
Corporate | Maximum | Matrix pricing model    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Spread over the industry-specific benchmark yield curve 0.0565 0.0565
Corporate | Maximum | Market com-parable companies    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
EBITDA multiples 30.7 27.9
Discount rate 17.00% 17.00%
Cash flow multiples 17.7 17.7
Corporate | Weighted Average | Matrix pricing model    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Spread over the industry-specific benchmark yield curve 0.0112 0.0125
Corporate | Weighted Average | Market com-parable companies    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
EBITDA multiples 13.0 12.9
Discount rate 11.30% 11.10%
Cash flow multiples 13.1 13.1
Separate Account assets | Third party appraisal    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Discount rate 6.50% 6.60%
Capitalization rate 4.60% 4.60%
Exit capitalization rate 5.60% 5.60%
Separate Account assets | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Spread over the industry-specific benchmark yield curve 0.0228 0.0243
Discount rate 4.624% 4.40%
GMIB reinsurance contracts | Minimum | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Lapse Rates 1.00% 1.00%
Withdrawal rates 0.00% 0.00%
Utilization rates 0.00% 0.00%
Non-performance risk 0.0005 0.0005
Volatility rates - Equity 9.70% 9.90%
GMIB reinsurance contracts | Maximum | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Lapse Rates 6.30% 6.30%
Withdrawal rates 8.00% 8.00%
Utilization rates 16.00% 16.00%
Non-performance risk 0.0010 0.0010
Volatility rates - Equity 31.15% 30.90%
GMIBNLG | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Non-performance risk 0.010 0.010
Volatility rates - Equity 20.00% 20.00%
GMIBNLG | Minimum | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Lapse Rates 0.80% 0.80%
Withdrawal rates 0.00% 0.00%
Utilization rates 0.00% 0.00%
Forfeiture Rates 0.55% 0.55%
GMIBNLG | Maximum | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Lapse Rates 26.20% 26.20%
Withdrawal rates 12.40% 12.40%
Utilization rates 16.00% 16.00%
Forfeiture Rates 2.10% 2.10%
GWBL/GMWB | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Utilization rates 100.00% 100.00%
GWBL/GMWB | Minimum | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Lapse Rates 0.90% 0.90%
Withdrawal rates 0.00% 0.00%
Volatility rates - Equity 9.70% 9.00%
GWBL/GMWB | Maximum | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Lapse Rates 5.70% 5.70%
Withdrawal rates 7.00% 7.00%
Volatility rates - Equity 31.15% 30.90%
GIB | Minimum | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Lapse Rates 0.90% 0.90%
Withdrawal rates 0.00% 0.00%
Utilization rates 0.00% 0.00%
Volatility rates - Equity 9.70% 9.90%
GIB | Maximum | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Lapse Rates 5.70% 5.70%
Withdrawal rates 7.00% 7.00%
Utilization rates 16.00% 16.00%
Volatility rates - Equity 31.15% 30.90%
GMAB | Minimum | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Lapse Rates 0.50% 0.50%
Volatility rates - Equity 9.70% 9.90%
GMAB | Maximum | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Lapse Rates 11.00% 11.00%
Volatility rates - Equity 31.15% 30.90%
Level 3 | Corporate | Matrix pricing model    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Assets, fair value $ 52 $ 53
Level 3 | Corporate | Market com-parable companies    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Assets, fair value 788 789
Level 3 | Separate Account assets | Third party appraisal    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Assets, fair value 332 326
Level 3 | Separate Account assets | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Assets, fair value 1 1
Level 3 | GMIB reinsurance contracts | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Assets, fair value 9,673 10,488
Level 3 | GMIBNLG | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Liabilities, fair value 3,715 4,056
Level 3 | GWBL/GMWB | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Liabilities, fair value 121 130
Level 3 | GIB | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Liabilities, fair value (36) (27)
Level 3 | GMAB | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Liabilities, fair value $ 4 $ 5