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INVESTMENTS (TROUBLED DEBT RESTRUCTURING) (Details)
$ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2015
USD ($)
Dec. 31, 2016
USD ($)
loan
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Financing Receivable, Modifications [Line Items]        
Gross interest income on restructured loans included in net investment income (loss)   $ 0 $ 1 $ 1
Gross interest income on restructured mortgage loans, Pre Modification   $ 0 0 $ 4
Commercial Real Estate Portfolio Segment        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loan   1    
Outstanding Recorded Investment Pre Modification   $ 15    
Outstanding Recorded Investment Post Modification   $ 15 $ 16  
Troubled debt restructuring, reduction of recorded investment $ 32      
Commercial Real Estate Portfolio Segment | Sale of Underlying Collateral        
Financing Receivable, Modifications [Line Items]        
Troubled debt restructuring, reduction of recorded investment $ 45