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INVESTMENTS (TROUBLED DEBT RESTRUCTURING) (Details) - Commercial Mortgage Loans
$ in Millions
1 Months Ended 3 Months Ended
Nov. 30, 2015
USD ($)
Mar. 31, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
Financing Receivable, Modifications [Line Items]      
Mortgage loans classified as nonaccrual   $ 34 $ 34
Reduced investments recorded in financing receivables $ 32    
Troubled debt restructuring, number of loans | loan   1  
Pre-modification, recorded investment   $ 15  
Post-modification, recorded investment   $ 15  
Sale of Underlying Collateral      
Financing Receivable, Modifications [Line Items]      
Reduced investments recorded in financing receivables $ 45