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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Principles of Consolidation (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2015
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]      
Equity method investment $ 1,100   $ 1,200
Percentage of carried interest received by general partners (up to)   1.00%  
KREF      
Schedule of Equity Method Investments [Line Items]      
Gain on equity method investment $ 54