XML 157 R135.htm IDEA: XBRL DOCUMENT v3.10.0.1
CONTRACTUAL COMMITMENTS - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of contingent liabilities [line items]    
Contractual commitments $ 2,466 $ 1,448
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 17.00%  
1 to 5 years    
Disclosure of contingent liabilities [line items]    
Contractual capital commitments, maturity, percent 38.00%  
Thereafter    
Disclosure of contingent liabilities [line items]    
Contractual capital commitments, maturity, percent 45.00%