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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Performance Obligation (Details)
$ in Billions
Dec. 31, 2020
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 20.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue expected to be recognized over next 12 months 25.00%
Performance obligation, term 12 months