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CONTRACTUAL COMMITMENTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Contractual Commitments [Abstract]    
Contractual commitments $ 1,448 $ 1,201
Asset management fee as percent per quarter 0.3125%  
Asset management fee, percent 1.25%  
Less than 1 year    
Disclosure of contingent liabilities [line items]    
Contractual capital commitments, maturity, percent 32.00%  
1 to 5 years    
Disclosure of contingent liabilities [line items]    
Contractual capital commitments, maturity, percent 42.00%  
Thereafter    
Disclosure of contingent liabilities [line items]    
Contractual capital commitments, maturity, percent 26.00%