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Note 3. Revenue Recognition Revenue Recognition - Adoption of the New Revenue Standard (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2016
Dec. 31, 2015
Cumulative Effect of New Accounting Pronouncements [Abstract]            
Trade receivables $ 146 $ 154 $ 153      
Other current assets 153 181 179      
Total current assets 768 792 789      
Other non-current assets 276 245 222      
Total assets 7,290 7,363 7,337 $ 7,421    
Accrued expenses and other current liabilities 401 480 478      
Total current liabilities 1,527 957 955      
Deferred income taxes 389 319 327      
Other non-current liabilities 259 266 212      
Total liabilities 4,975 4,763 4,715      
Accumulated deficit (2,507)   (2,631)      
Accumulated other comprehensive loss (52)   (37)      
Total stockholders' equity 2,311 2,596 2,618      
Total equity 2,315 2,600 2,622 $ 2,469   $ 2,422
Total liabilities and equity $ 7,290 7,363 $ 7,337      
Cumulative Effect of New Accounting Principle in Period of Adoption   (22)     $ 5  
Accounting Standards Update 2014-09 | Trade Accounts Receivable            
Cumulative Effect of New Accounting Pronouncements [Abstract]            
Adjustments due to the adoption of the new revenue standard   1        
Accounting Standards Update 2014-09 | Other Current Assets            
Cumulative Effect of New Accounting Pronouncements [Abstract]            
Adjustments due to the adoption of the new revenue standard   2        
Accounting Standards Update 2014-09 | Current Assets            
Cumulative Effect of New Accounting Pronouncements [Abstract]            
Adjustments due to the adoption of the new revenue standard   3        
Accounting Standards Update 2014-09 | Other non-current assets            
Cumulative Effect of New Accounting Pronouncements [Abstract]            
Adjustments due to the adoption of the new revenue standard   23        
Accounting Standards Update 2014-09 | Assets, Total            
Cumulative Effect of New Accounting Pronouncements [Abstract]            
Adjustments due to the adoption of the new revenue standard   26        
Accounting Standards Update 2014-09 | Accounts Payable and Accrued Liabilities            
Cumulative Effect of New Accounting Pronouncements [Abstract]            
Adjustments due to the adoption of the new revenue standard   2        
Accounting Standards Update 2014-09 | Current Liabilities            
Cumulative Effect of New Accounting Pronouncements [Abstract]            
Adjustments due to the adoption of the new revenue standard   2        
Accounting Standards Update 2014-09 | Deferred Income Tax Charge            
Cumulative Effect of New Accounting Pronouncements [Abstract]            
Adjustments due to the adoption of the new revenue standard   (8)        
Accounting Standards Update 2014-09 | Other Noncurrent Liabilities            
Cumulative Effect of New Accounting Pronouncements [Abstract]            
Adjustments due to the adoption of the new revenue standard   54        
Accounting Standards Update 2014-09 | Liabilities, Total            
Cumulative Effect of New Accounting Pronouncements [Abstract]            
Adjustments due to the adoption of the new revenue standard   48        
Accounting Standards Update 2014-09 | Accumulated Deficit            
Cumulative Effect of New Accounting Pronouncements [Abstract]            
Adjustments due to the adoption of the new revenue standard [1]   (22)        
Accounting Standards Update 2014-09 | Accumulated Other Comprehensive Loss            
Cumulative Effect of New Accounting Pronouncements [Abstract]            
Adjustments due to the adoption of the new revenue standard [1]   0        
Accounting Standards Update 2014-09 | Stockholders' Equity, Total            
Cumulative Effect of New Accounting Pronouncements [Abstract]            
Adjustments due to the adoption of the new revenue standard   (22)        
Accounting Standards Update 2014-09 | Liabilities and Equity, Total            
Cumulative Effect of New Accounting Pronouncements [Abstract]            
Adjustments due to the adoption of the new revenue standard   26        
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)        
[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 2, "Summary of Significant Accounting Policies" in the "Recently Adopted Accounting Pronouncements" section for additional information.