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REVENUE (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Disaggregation of Revenue [Line Items]          
Contract assets $ 0   $ 0   $ 0
Trade receivables 1,070,000,000.00   1,070,000,000.00   1,090,000,000.00
Amount of revenue recognized, previously included in deferred revenue 43,000,000   101,000,000    
Increase in deferred revenue during the period 45,000,000   102,000,000    
Contracted not recognized revenue 2,800,000,000   2,800,000,000    
Capitalized sales commissions 106,000,000   106,000,000   107,000,000
Initial direct costs of leases     53,000,000   53,000,000
Amortization of capitalized sales commissions 11,000,000 $ 9,000,000 22,000,000 $ 17,000,000  
ChoiceLease          
Disaggregation of Revenue [Line Items]          
Capitalized sales commissions $ 92,000,000   $ 92,000,000   $ 93,000,000
Minimum          
Disaggregation of Revenue [Line Items]          
Term of contract 1 day   1 day    
Minimum | ChoiceLease          
Disaggregation of Revenue [Line Items]          
Term of contract 3 years   3 years    
Minimum | DTS And SCS          
Disaggregation of Revenue [Line Items]          
Term of contract 3 years   3 years    
Maximum          
Disaggregation of Revenue [Line Items]          
Term of contract 1 year   1 year    
Maximum | ChoiceLease          
Disaggregation of Revenue [Line Items]          
Term of contract 7 years   7 years    
Maximum | DTS And SCS          
Disaggregation of Revenue [Line Items]          
Term of contract 5 years   5 years