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REINSURANCE AGREEMENTS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]            
Reinsurance retention policy, percentage of excess reinsured 100.00%          
Guaranteed minimum income benefit reinsurance asset, at fair value $ 10,488 $ 10,314   $ 10,900 $ 11,260 $ 9,798
Increase (decrease) in the fair value of the reinsurance contract asset 174 (268) $ (141)      
Amounts due to reinsurers 134 125        
Non Affiliated Entity            
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]            
Reinsurance recoverables related to insurance contracts 2,420 2,458        
Amounts due to reinsurers 134 125        
Non Affiliated Entity | Credit Concentration Risk            
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]            
Reinsurance recoverables related to insurance contracts 1,904 2,381        
Variable Universal Term Life Insurance Single Life            
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]            
Reinsurance retention policy, amount retained 25          
Variable Universal Term Life Insurance Joint Life            
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]            
Reinsurance retention policy, amount retained 30          
Group Life And Health Insurance | Non Affiliated Entity            
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]            
Insurance liabilities ceded 71 82        
Reinsurance assumed reserves $ 716 $ 734        
GMDB | Non Affiliated Entity            
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]            
Exposure reinsured percentage 3.50%          
GMIB | Non Affiliated Entity            
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]            
Exposure reinsured percentage 16.80%