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Employee Benefit Plans (Summary of Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]      
Options, outstanding, Beginning of period (in shares) 5,431,739    
Options, granted (in shares) 818,100    
Options, forfeited (in shares) (24,465)    
Options, exercised (in shares) (1,122,244)    
Options, Expired or canceled (in shares) 0    
Options, outstanding, end of period (in shares) 5,103,130 5,431,739  
Options, vested, end of period (in shares) 4,625,221    
Options, exercisable, end of period (in shares) 3,684,109    
Weighted-Average exercise price, outstanding, beginning of period (in dollars per share) $ 41.27    
Weighted-Average exercise price, granted (in dollars per share) 78.86    
Weighted-Average exercise price, forfeited (in dollars per share) 77.85    
Weighted-Average exercise price, exercised (in dollars per share) 30.53    
Weighted-Average exercise price, expired or canceled (in dollars per share) 0    
Weighted-Average exercise price, outstanding, end of period (in dollars per share) 49.48 $ 41.27  
Weighted-Average exercise price, vested, End of period (in dollars per share) 46.6    
Weighted-Average exercise price, exercisable, End of period (in dollars per share) 39.06    
Weighted average grant date fair value of options granted (in dollars per share) $ 16.94 $ 18.84 $ 18.95
Intrinsic value of options exercised $ 58 $ 60 $ 89
Aggregate intrinsic value, options, vested, end of period 185    
Aggregate intrinsic value, options, exercisable, end of period $ 175