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REINSURANCE - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Reinsurer
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Effects of Reinsurance [Line Items]      
Reinsurance recoverables $ 267 $ 314  
Premiums ceded 1,000 976 $ 969
Benefits ceded $ 881 980 $ 844
Number of reinsurers comprising other reinsurance recoverables balance | Reinsurer 11    
Cash and securities in trusts held by certain reinsurers $ 72    
100% Coinsurance Agreements      
Effects of Reinsurance [Line Items]      
Percentage of coinsurance agreement 100.00%    
Reinsurance Recoverables | Reinsurer Concentration Risk      
Effects of Reinsurance [Line Items]      
Reinsurance recoverables $ 267 $ 313  
Protective Life Insurance Company      
Effects of Reinsurance [Line Items]      
Reinsurance recoverables 174    
All others      
Effects of Reinsurance [Line Items]      
Reinsurance recoverables $ 94