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FAIR VALUE DISCLOSURES (QUANTITATIVE INFORMATION ABOUT LEVEL 3) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value measurements not included In quantitative information about level 3 $ 650 $ 594    
Level 3 fair value measurements not included in quantitative information classified as level 3 (as a percent) 37.10% 37.50%    
Level 3 fair value measurements not included in quantitative information as a percentage of total assets measured at fair value on a recurring basis (as a percent) 0.40% 0.40%    
Corporate | Matrix Pricing Model | Private Available For Sale Corporate Securities        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis $ 794 $ 691    
Percentage of level 3 asset fair value (as a percent) 78.30% 81.80%    
Asset-backed Securities | Matrix Pricing Model        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Percentage of level 3 asset fair value (as a percent) 0.00% 8.30%    
Separate Accounts | Mortgage Backed Securities        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis $ 13 $ 12    
Separate Accounts | Asset-backed Securities        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis 4 3    
Separate Accounts | Third Party Appraisal | Mortgage Loans on Real Estate        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis 2 2    
Separate Accounts | Third Party Appraisal | Private Real Estate Fund        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis 306 295    
Separate Accounts | Third Party Appraisal | Private Equity Funds        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis 2 1    
Contingent Payment Arrangement        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis $ 17 $ 18    
Fair value inputs, assets under management growth rate (as a percent)   18.00%    
Minimum | Contingent Payment Arrangement        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value inputs, discount rate (as a percent) 1.40%      
Fair value inputs, long-term revenue growth rate (as a percent) 4.00%      
Maximum | Contingent Payment Arrangement        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value inputs, discount rate (as a percent) 6.40%      
Fair value inputs, long-term revenue growth rate (as a percent) 31.00%      
Level 3 | Gmib Reinsurance | Discounted Cash Flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis $ 9,795 $ 10,309    
Level 3 | Corporate | Matrix Pricing Model        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis 41 55    
Level 3 | Corporate | Market Comparable Companies        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis 753 636    
Level 3 | Asset-backed Securities | Matrix Pricing Model        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis   2    
Level 3 | Separate Accounts | Third Party Appraisal        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis 306 295    
Level 3 | Separate Accounts | Discounted Cash Flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis 2 3    
Level 3 | GMWB and GWBL | Discounted Cash Flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis $ 106 $ 164    
Other Invested Assets | Market Comparable Companies        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value inputs, discount rate (as a percent) 0.00% 0.00%    
Other Invested Assets | Minimum | Market Comparable Companies        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value inputs, revenue multiple 0 0    
Other Invested Assets | Maximum | Market Comparable Companies        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value inputs, revenue multiple 0 0    
GMWB and GWBL | Minimum | Discounted Cash Flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value inputs, lapse rates (as a percent) 1.00% 1.00%    
Fair value inputs, withdrawal rates (as a percent) 0.00% 0.00%    
Fair value input, expected volatility rate (as a percent) 10.00% 11.00%    
GMWB and GWBL | Maximum | Discounted Cash Flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value inputs, lapse rates (as a percent) 11.00% 11.00%    
Fair value inputs, withdrawal rates (as a percent) 8.00% 8.00%    
Fair value input, expected volatility rate (as a percent) 37.00% 38.00%    
Gmib Reinsurance | Minimum | Discounted Cash Flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value inputs, lapse rates (as a percent) 1.50% 1.50%    
Fair value inputs, withdrawal rates (as a percent) 0.00% 0.00%    
Fair value inputs, GIMB utilization rates (as a percent) 0.00% 0.00%    
Fair value inputs, non-performance risk (bps) 5 5    
Fair value input, expected volatility rate (as a percent) 10.00% 11.00%    
Gmib Reinsurance | Maximum | Discounted Cash Flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value inputs, lapse rates (as a percent) 5.70% 5.70%    
Fair value inputs, withdrawal rates (as a percent) 8.00% 8.00%    
Fair value inputs, GIMB utilization rates (as a percent) 16.00% 16.00%    
Fair value inputs, non-performance risk (bps) 16 17    
Fair value input, expected volatility rate (as a percent) 37.00% 38.00%    
Gmib Reinsurance | Level 3        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis $ 9,795 $ 10,309 $ 12,207 $ 10,570
Separate Accounts | Third Party Appraisal        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value inputs, discount rate (as a percent) 6.60% 6.60%    
Fair value inputs, capitalization rate (as a percent) 4.70% 4.80%    
Fair value inputs, exit capitalization rate (as a percent) 5.70% 5.70%    
Separate Accounts | Minimum | Discounted Cash Flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value inputs, spread over industry yield curve (bps) 253 273    
Fair value inputs, discount rate (as a percent) 4.20% 1.10%    
Fair value inputs, inflation rate (as a percent) 0.00% 0.00%    
Separate Accounts | Maximum | Discounted Cash Flow        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value inputs, spread over industry yield curve (bps) 492 512    
Fair value inputs, discount rate (as a percent) 6.70% 7.00%    
Separate Accounts | Level 3        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis $ 325 $ 313 323 313
Asset-backed Securities | Minimum | Matrix Pricing Model        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value inputs, spread over industry yield curve (bps) 0 25    
Asset-backed Securities | Maximum | Matrix Pricing Model        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value inputs, spread over industry yield curve (bps) 0 687    
Asset-backed Securities | Level 3        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis $ 31 $ 24 37 40
Corporate | Minimum | Matrix Pricing Model        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value inputs, spread over industry yield curve (bps) 125 0    
Corporate | Minimum | Market Comparable Companies        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value inputs, earnings before interest, taxes, depreciation and amortization multiple 4.3 4.3    
Fair value inputs, discount rate (as a percent) 7.00% 7.00%    
Fair value inputs, cash flow multiple 14.0 14.0    
Corporate | Maximum | Matrix Pricing Model        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value inputs, spread over industry yield curve (bps) 565 565    
Corporate | Maximum | Market Comparable Companies        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value inputs, earnings before interest, taxes, depreciation and amortization multiple 40.0 25.6    
Fair value inputs, discount rate (as a percent) 17.80% 17.80%    
Fair value inputs, cash flow multiple 16.5 16.5    
Corporate | Level 3        
Fair Value Inputs Assets Quantitative Information 1 [Line Items]        
Fair value, measurement with unobservable inputs reconciliation, recurring basis $ 1,014 $ 845 $ 498 $ 420