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Revenue from Contracts with Customers - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Jan. 01, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]        
Deferred revenue, revenue recognized   $ 242    
Revenue, remaining performance obligation   843    
Accumulated deficit   (637)   $ (579)
Capitalized contract cost, net   22   17
Income tax expense (benefit)   (1) $ 0  
Revenues   506 491  
Selling, general and administrative expenses   152 155  
Net loss   $ (7) $ (2)  
Basic (in dollars per share)   $ (0.06) $ (0.02)  
Assets   $ 2,355   2,556
Liabilities   1,711   $ 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      
Income tax expense (benefit) 10      
Unbilled contracts receivable 20      
Revenues 1      
Selling, general and administrative expenses 5      
Net loss   $ 4    
Basic (in dollars per share)   $ 0.03    
Assets 22      
Liabilities 20      
Deferred Tax Liability [Member] | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606        
Disaggregation of Revenue [Line Items]        
Accumulated deficit $ 26