REVENUE FROM CONTRACTS WITH CUSTOMERS - Remaining Performance Obligations (Details) $ in Billions	Sep. 30, 2019 USD ($)
Revenue from Contract with Customer [Abstract]
Amount of remaining performance obligation	$ 1.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue from Contract with Customer [Abstract]
Amount of remaining performance obligation	$ 0.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction for remaining performance obligation	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue from Contract with Customer [Abstract]
Amount of remaining performance obligation	$ 0.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction for remaining performance obligation	12 months