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Revenue from Contracts with Customers - Impacts on Financial Statements (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Jan. 01, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                        
Accumulated deficit   $ (823)       $ (579)       $ (823) $ (579)  
Increase in other assets   54       17       54 17  
Tax impact                   (3) 125 $ 96
Selling, general and administrative expenses                   666 651 662
Net income (loss)   $ 15 $ 18 $ 4 $ (7) $ (74) $ 13 $ (4) $ (2) $ 30 $ (67) $ 125
Basic (in usd per share)   $ 0.13 $ 0.15 $ 0.03 $ (0.06) $ (0.61) $ 0.11 $ (0.03) $ (0.02) $ 0.25 $ (0.53) $ 0.96
Assets   $ 2,360       $ 2,556       $ 2,360 $ 2,556  
Contract with customer, deferred costs   595       499       595 499  
Liabilities   1,865       $ 1,888       1,865 $ 1,888  
Accounting Standards Update 2014-09                        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                        
Accumulated deficit $ 19                      
Increase in other assets 17 54               54    
Tax impact 10                      
Unbilled contract receivables 20                      
Revenues                   15    
Selling, general and administrative expenses                   37    
Net income (loss)                   $ 33    
Basic (in usd per share)                   $ 0.27    
Assets   43               $ 43    
Contract with customer, deferred costs   11               11    
Liabilities   $ 16               $ 16    
Deferred Tax Liability | Accounting Standards Update 2014-09                        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                        
Accumulated deficit $ 26