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Revenue from Contracts with Customers - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Jan. 01, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]            
Deferred revenue, revenue recognized       $ 345    
Remaining performance obligation, amount of customer only general cancellation   $ 979   979    
Remaining performance obligation, amount of non-cancelable contracts   538   538    
Accumulated deficit   (745)   (745)   $ (579)
Capitalized contract cost, net   32   32   17
Income tax expense (benefit)   (8) $ (7) (7) $ (6)  
Revenues   11 6 27 15  
Selling, general and administrative expenses   166 161 481 481  
Net income   $ 18 $ 13 $ 15 $ 7  
Basic (in dollars per share)   $ 0.15 $ 0.11 $ 0.13 $ 0.05  
Assets   $ 2,136   $ 2,136   2,556
Contract with customer, liability   486   486   499
Liabilities   1,576   1,576   $ 1,888
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606            
Disaggregation of Revenue [Line Items]            
Accumulated deficit $ 19          
Capitalized contract cost, net 17 32   32    
Income tax expense (benefit) 10          
Unbilled contracts receivable 20          
Revenues   9   11    
Selling, general and administrative expenses   5   15    
Net income   $ 3   $ 12    
Basic (in dollars per share)   $ 0.02   $ 0.10    
Assets   $ 22   $ 22    
Contract with customer, liability   $ 10   $ 10    
Liabilities 16          
Deferred Tax Liability | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606            
Disaggregation of Revenue [Line Items]            
Accumulated deficit $ 26