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Revenues (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]      
Remaining performance obligation $ 489,000,000    
Remaining performance obligation period of recognition 2 years    
Capitalized Contract Cost [Line Items]      
Capitalized contract, impairment loss $ 0    
Deferred revenue 382,000,000   $ 334,000,000
Revenue recognized which was previously included in deferred revenue 181,000,000    
Other long-term assets 87,000,000 $ 77,000,000 $ 65,000,000
Sales Commissions      
Capitalized Contract Cost [Line Items]      
Amortization expense related to commissions 10,000,000    
Deferred commissions 15,000,000    
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606      
Capitalized Contract Cost [Line Items]      
Other long-term assets   12,000,000  
Prepaid expenses and other current assets      
Capitalized Contract Cost [Line Items]      
Contract assets $ 5,000,000 $ 7,000,000