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Income Taxes (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended 22 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2016
Jun. 30, 2016
Dec. 31, 2012
Income Tax Disclosure [Line Items]            
Undistributed earnings $ 144          
Income tax benefits primarily related to share-based compensation 41 $ 34 $ 9      
Unrecognized tax benefits that would impact effective tax rate 40 33        
Interest and penalties related to income tax 8 7        
Reserve for uncertainty of tax matters 5          
Previously unrecognized tax benefits recognized 4 2        
Federal Tax Authority            
Income Tax Disclosure [Line Items]            
Tax Benefit       $ 10    
Foreign Tax Authority | SE            
Income Tax Disclosure [Line Items]            
Unrecognized tax benefits that would impact effective tax rate   5        
Additional tax assessment   6        
Decrease in operating expenses associated with receivable under tax sharing agreement   6        
Reversal of VAT refund receivables $ 38         $ 50
Tax expense (benefits), per diluted share (in dollars per share) $ 0.22          
Increase in tax expense related to receivable under tax sharing agreement   $ 12        
Foreign Tax Authority | FI            
Income Tax Disclosure [Line Items]            
Reversal of VAT refund receivables       30 $ 28  
Income taxes paid       41    
Interest and penalties paid       11    
Tax expense (benefits), per diluted share (in dollars per share)         $ 0.17  
Tax benefits, and related interest and penalties       $ 38    
Quarterly recurring tax benefits $ 1          
Foreign Tax Authority | Minimum | SE            
Income Tax Disclosure [Line Items]            
Quarterly recurring tax benefits 1          
Foreign Tax Authority | Maximum | SE            
Income Tax Disclosure [Line Items]            
Quarterly recurring tax benefits $ 2