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Revenue Recognition Revenue Recognition - Adoption of the New Revenue Standard (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Cumulative Effect of New Accounting Pronouncements[Abstract]              
Trade receivables $ 180   $ 154 $ 153      
Other current assets 154   181 179      
Total current assets 905   792 789      
Other non-current assets 284   245 222      
Assets 7,438   7,363 7,337      
Accrued expenses and other current liabilities 395   480 478      
Total current liabilities 1,567   957 955      
Deferred income taxes 378   319 327      
Other non-current liabilities 244   266 212      
Total liabilities 4,995   4,763 4,715      
Accumulated deficit (2,485)     (2,631)      
Accumulated other comprehensive loss (47)     (37)      
Total stockholders' equity 2,439   2,596 2,618      
Total equity 2,443 $ 2,442 2,600 2,622 $ 2,465 $ 2,423 $ 2,469
Total liabilities and equity $ 7,438   7,363 $ 7,337      
Cumulative effect of adoption of new accounting pronouncements     (22)        
Accounting Standards Update 2014-09              
Cumulative Effect of New Accounting Pronouncements[Abstract]              
Cumulative effect of adoption of new accounting pronouncements     (22)        
Accounting Standards Update 2018-02              
Cumulative Effect of New Accounting Pronouncements[Abstract]              
Accumulated deficit [1]     (2,622)        
Accumulated other comprehensive loss [1]     (46)        
Cumulative effect of adoption of new accounting pronouncements     9        
Accounting Standards Update 2018-02 and 2014-09              
Cumulative Effect of New Accounting Pronouncements[Abstract]              
Accumulated deficit [1]     (2,644)        
Accumulated other comprehensive loss [1]     (46)        
Trade Accounts Receivable | Accounting Standards Update 2014-09              
Cumulative Effect of New Accounting Pronouncements[Abstract]              
Adjustments due to the adoption of the new revenue standard     1        
Other Current Assets | Accounting Standards Update 2014-09              
Cumulative Effect of New Accounting Pronouncements[Abstract]              
Adjustments due to the adoption of the new revenue standard     2        
Current Assets | Accounting Standards Update 2014-09              
Cumulative Effect of New Accounting Pronouncements[Abstract]              
Adjustments due to the adoption of the new revenue standard     3        
Other Non-Current Assets | Accounting Standards Update 2014-09              
Cumulative Effect of New Accounting Pronouncements[Abstract]              
Adjustments due to the adoption of the new revenue standard     23        
Assets, Total | Accounting Standards Update 2014-09              
Cumulative Effect of New Accounting Pronouncements[Abstract]              
Adjustments due to the adoption of the new revenue standard     26        
Accounts Payable and Accrued Liabilities | Accounting Standards Update 2014-09              
Cumulative Effect of New Accounting Pronouncements[Abstract]              
Adjustments due to the adoption of the new revenue standard     2        
Current Liabilities | Accounting Standards Update 2014-09              
Cumulative Effect of New Accounting Pronouncements[Abstract]              
Adjustments due to the adoption of the new revenue standard     2        
Deferred Income Tax Charge | Accounting Standards Update 2014-09              
Cumulative Effect of New Accounting Pronouncements[Abstract]              
Adjustments due to the adoption of the new revenue standard     (8)        
Other Non-Current Liabilities | Accounting Standards Update 2014-09              
Cumulative Effect of New Accounting Pronouncements[Abstract]              
Adjustments due to the adoption of the new revenue standard     54        
Liabilities, Total | Accounting Standards Update 2014-09              
Cumulative Effect of New Accounting Pronouncements[Abstract]              
Adjustments due to the adoption of the new revenue standard     48        
Retained Earnings | Accounting Standards Update 2014-09              
Cumulative Effect of New Accounting Pronouncements[Abstract]              
Adjustments due to the adoption of the new revenue standard [1]     (22)        
AOCI Attributable to Parent | Accounting Standards Update 2014-09              
Cumulative Effect of New Accounting Pronouncements[Abstract]              
Adjustments due to the adoption of the new revenue standard [1]     0        
Stockholders' Equity, Total | Accounting Standards Update 2014-09              
Cumulative Effect of New Accounting Pronouncements[Abstract]              
Adjustments due to the adoption of the new revenue standard     (22)        
Liabilities and Equity, Total | Accounting Standards Update 2014-09              
Cumulative Effect of New Accounting Pronouncements[Abstract]              
Adjustments due to the adoption of the new revenue standard     $ 26        
[1] Beginning balances have been adjusted for the adoption of the accounting standard update on stranded tax effects related to the 2017 Tax Act which resulted in a debit to Accumulated other comprehensive loss and a credit to Accumulated deficit of $9 million. See Note 1, "Basis of Presentation" in the "Recently Adopted Accounting Pronouncements" section for additional information.