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Revenue Recognition Revenue Recognition - Adoption of the New Revenue Standard (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Cumulative Effect of New Accounting Pronouncements[Abstract]      
Trade receivables $ 198 $ 154 $ 153
Other current assets 156 181 179
Total current assets 929 792 789
Other non-current assets 290 245 222
Assets 7,491 7,363 7,337
Accrued expenses and other current liabilities 413 480 478
Total current liabilities 1,640 957 955
Deferred income taxes 341 319 327
Other non-current liabilities 256 266 212
Total liabilities 5,049 4,763 4,715
Accumulated deficit (2,588)   (2,631)
Accumulated other comprehensive loss (47)   (37)
Total stockholders' equity 2,439 2,596 2,618
Total equity 2,442 2,600 2,622
Total liabilities and equity $ 7,491 7,363 $ 7,337
Accounting Standards Update 2014-09      
Cumulative Effect of New Accounting Pronouncements[Abstract]      
Cumulative Effect of New Accounting Principle in Period of Adoption   (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 New Accounting Principle in Period of Adoption   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.