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REVENUE FROM CONTRACTS WITH CUSTOMERS - Remaining Performance Obligations (Details)
$ in Billions
Jun. 30, 2019
USD ($)
Revenue from Contract with Customer [Abstract]  
Revenue, remaining performance obligation, amount $ 1.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01  
Revenue from Contract with Customer [Abstract]  
Revenue, remaining performance obligation, amount $ 0.5
Revenue from Contracts with Customers  
Revenue, remaining performance obligation, period 3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01  
Revenue from Contract with Customer [Abstract]  
Revenue, remaining performance obligation, amount $ 0.9
Revenue from Contracts with Customers  
Revenue, remaining performance obligation, period 12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01  
Revenue from Contract with Customer [Abstract]  
Revenue, remaining performance obligation, amount $ 0.2
Revenue from Contracts with Customers  
Revenue, remaining performance obligation, period 12 months