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CONTRACTUAL COMMITMENTS - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of contingent liabilities [line items]    
Contractual commitments $ 5,750 $ 3,801
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 10.00%  
1 to 5 years    
Disclosure of contingent liabilities [line items]    
Contractual capital commitments, maturity, percent 22.00%  
Thereafter    
Disclosure of contingent liabilities [line items]    
Contractual capital commitments, maturity, percent 68.00%