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FAIR VALUE DISCLOSURES - NARRATIVE (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
contingent_liability
Dec. 31, 2016
USD ($)
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Fair value measurements not included in quantitative information about level 3 fair value measurements $ 370 $ 594
Fair value measurements not included in quantitative information percentage of total assets classified as level 3 24.00% 37.50%
Fair value measurements not included in quantitative information percentage of total assets measured at fair value on recurring basis 0.20% 0.40%
Public corporate | Matrix Pricing Model Valuation Technique | Private corporate    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Fair value unobservable inputs, assets $ 842 $ 691
Percentage of level 3 asset fair value 73.90% 81.80%
Asset- backed    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Fair value unobservable inputs, assets $ 8 $ 3
Asset- backed | Matrix Pricing Model Valuation Technique    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Percentage of level 3 asset fair value 4.50% 8.30%
Separate Accounts’ assets    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Fair value unobservable inputs, assets $ 14 $ 12
Separate Accounts’ assets | Discounted Cash Flow Valuation Technique | Private Equity Funds    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Fair value unobservable inputs, assets 0 1
Separate Accounts’ assets | Discounted Cash Flow Valuation Technique | Mortgage loans on real estate    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Fair value unobservable inputs, assets 1 2
Separate Accounts’ assets | Third Party Appraisal And Discounted Cash Flow Valuation Technique | Private Real Estate Fund    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Fair value unobservable inputs, assets $ 326 295
Contingent payment arrangements | AUM Growth Rates    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Number of contingent liability arrangements | contingent_liability 3  
Number of business acquisitions | contingent_liability 3  
Contingent payment arrangements | Two Thousand And Sixteen Acquisitions    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Number of contingent liability arrangements | contingent_liability 1  
Business combination, contingent consideration, liability $ 11  
Revenue growth rate 31.00%  
Contingent payment arrangements | Two Thousand And Sixteen Acquisitions | AUM Growth Rates    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Fair value unobservable inputs, assets $ 18 $ 18
Number of contingent liability arrangements | contingent_liability 1  
Projected AUM growth rate 18.00%  
Contingent payment arrangements | Two Thousand And Sixteen Acquisitions | Minimum    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Discount rate 1.40%  
Contingent payment arrangements | Two Thousand And Sixteen Acquisitions | Minimum | AUM Growth Rates    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Revenue growth rate 4.00% 1.40%
Contingent payment arrangements | Two Thousand And Sixteen Acquisitions | Maximum    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Discount rate 2.30%  
Contingent payment arrangements | Two Thousand And Sixteen Acquisitions | Maximum | AUM Growth Rates    
Fair Value Inputs Assets Quantitative Information 1 [Line Items]    
Revenue growth rate 31.00% 6.40%