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- Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Contract assets $ 0 $ 0  
Deferred revenue recognized 181,000,000    
Deferred consideration during period 203,000,000    
Deferred revenue 603,687,000 582,078,000  
Contracted not recognized revenue 2,900,000,000    
Capitalized sales commissions 105,000,000 107,000,000  
Initial direct costs of leases 55,000,000 53,000,000  
Sales commissions expense 43,000,000 37,000,000 $ 33,000,000
ChoiceLease      
Disaggregation of Revenue [Line Items]      
Deferred revenue $ 587,000,000 $ 566,000,000  
Minimum | ChoiceLease      
Disaggregation of Revenue [Line Items]      
Term of contract 3 years    
Minimum | DTS and SCS      
Disaggregation of Revenue [Line Items]      
Term of contract 3 years    
Maximum | ChoiceLease      
Disaggregation of Revenue [Line Items]      
Term of contract 7 years    
Maximum | DTS and SCS      
Disaggregation of Revenue [Line Items]      
Term of contract 5 years