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Stock-Based Compensation (RSU Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Number of Shares    
Beginning Balance 1,510,923  
Granted 218,364  
Additional shares vested 168,477  
Released from restrictions (744,954)  
Forfeited (58,649)  
Ending Balance 1,094,161  
Vested or expected vest, at end of period 1,058,059  
Weighted Average Fair Value    
Beginning Balance (in dollars per share) $ 97.64  
Granted (in dollars per share) 112.52  
Additional shares vested (in dollars per share) 77.53  
Released from restrictions (in dollars per share) 42.84  
Forfeited (in dollars per share) 50.22  
Ending Balance (in dollars per share) 119.26  
Vested or expected to vest, at end of period (in dollars per share) $ 120.13  
Intrinsic Value (in millions)    
Outstanding $ 108 $ 173
Vested or expected to vest, at end of period $ 105