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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 20 $ 18 $ 54 $ 55
Stock option expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 2 2 6 11
Restricted stock and unit awards expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 18 $ 16 $ 48 $ 44
Award grants (in shares)     0.6  
Award grants, weighted average grant date fair value (in dollars per share)     $ 100.31  
Unrecognized compensation expense $ 65   $ 65  
Unrecognized compensation expense, period for recognition     1 year 8 months 60 days