SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Performance Obligation (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 $ in Billions	Dec. 31, 2019 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 21.3
Revenue expected to be recognized over next 12 months	25.00%
Performance obligation, term	12 months