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INVESTMENTS (REPURCHASE TO MATURITY TRANSACTIONS) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Derivative [Line Items]    
Securities sold under agreement to repurchase(2) $ 1,992 $ 1,890
Securities purchased under agreements to resell   79
Securities sold under agreements to repurchase 4  
U.S. Treasury, government and agency    
Derivative [Line Items]    
Securities sold under agreement to repurchase(2) 1,992 1,890
Corporate    
Derivative [Line Items]    
Securities purchased under agreements to resell   79
Maturity Overnight and on Demand    
Derivative [Line Items]    
Securities sold under agreement to repurchase(2) 0 0
Securities purchased under agreements to resell   0
Maturity Overnight and on Demand | U.S. Treasury, government and agency    
Derivative [Line Items]    
Securities sold under agreement to repurchase(2) 0 0
Maturity Overnight and on Demand | Corporate    
Derivative [Line Items]    
Securities purchased under agreements to resell   0
Maturity Less than 30 Days    
Derivative [Line Items]    
Securities sold under agreement to repurchase(2) 1,992 1,865
Securities purchased under agreements to resell   79
Maturity Less than 30 Days | U.S. Treasury, government and agency    
Derivative [Line Items]    
Securities sold under agreement to repurchase(2) 1,992 1,865
Maturity Less than 30 Days | Corporate    
Derivative [Line Items]    
Securities purchased under agreements to resell   79
Maturity 30 to 90 Days    
Derivative [Line Items]    
Securities sold under agreement to repurchase(2) 0 25
Securities purchased under agreements to resell   0
Maturity 30 to 90 Days | U.S. Treasury, government and agency    
Derivative [Line Items]    
Securities sold under agreement to repurchase(2) 0 25
Maturity 30 to 90 Days | Corporate    
Derivative [Line Items]    
Securities purchased under agreements to resell   0
Maturity Greater than 90 Days    
Derivative [Line Items]    
Securities sold under agreement to repurchase(2) 0 0
Securities purchased under agreements to resell   0
Maturity Greater than 90 Days | U.S. Treasury, government and agency    
Derivative [Line Items]    
Securities sold under agreement to repurchase(2) 0 0
Maturity Greater than 90 Days | Corporate    
Derivative [Line Items]    
Securities purchased under agreements to resell   0
Investment Management    
Derivative [Line Items]    
Securities Borrowed $ 83 75
Securities Loaned   $ 10