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Revenue from Contracts with Customers - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jan. 01, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]            
Deferred revenue, revenue recognized       $ 335    
Remaining performance obligation, amount of customer only general cancellation   $ 923   923    
Remaining performance obligation, amount of non-cancelable contracts   522   522    
Accumulated deficit   (714)   (714)   $ (579)
Capitalized contract cost, net   24   24   17
Income tax expense (benefit)   2 $ 1 1 $ 1  
Selling, general and administrative expenses   163 165 315 320  
Net income (loss)   $ 4 $ (4) $ (3) $ (6)  
Basic (in dollars per share)   $ 0.03 $ (0.03) $ (0.02) $ (0.05)  
Assets   $ 2,203   $ 2,203   2,556
Contract with customer, liability   570   570   499
Liabilities   1,631   1,631   $ 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 24   24    
Income tax expense (benefit) 10          
Unbilled contracts receivable 20          
Revenues   19   20    
Selling, general and administrative expenses   3   8    
Net income (loss)   $ 4   $ 8    
Basic (in dollars per share)   $ 0.03   $ 0.07    
Assets   $ 8   $ 8    
Contract with customer, liability   $ 16   $ 16    
Liabilities 36          
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