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Stock-based Compensation - Stock Options and RSUs Outstanding (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Employee Stock Option      
Stock Options, Shares      
Exercised (in shares) (11,953,455) (19,503,382) (45,507,711)
Employee Stock Option | Long-term incentive and director compensation plans      
Stock Options, Shares      
Options outstanding, Beginning balance (in shares) 57,647,446    
Granted (in shares) 11,913,832    
Forfeited and expired (in shares) (833,840)    
Exercised (in shares) (11,953,455)    
Options outstanding, Ending balance (in shares) 56,773,983 57,647,446  
Stock Options, Weighted Average Exercise Price per Share      
Weighted-average exercise price, Outstanding, Beginning of period (in dollars per share) $ 32.84    
Weighted-average exercise price, Granted (in dollars per share) 53.95    
Weighted-average exercise price, Forfeited and expired (in dollars per share) 42.71    
Weighted-average exercise price, Exercised (in dollars per share) 31.33    
Weighted-average exercise price, Outstanding, End of period (in dollars per share) $ 37.45 $ 32.84  
Restricted Stock Units (RSUs)      
Restricted Stock Units, Shares      
Vested RSUs (in shares) (3,386,415) (5,609,627) (5,741,981)
Restricted Stock Units (RSUs) | Long-term incentive and director compensation plans      
Restricted Stock Units, Shares      
Awards outstanding other than options, Beginning balance (in shares) 17,303,815    
Granted (in shares) 2,679,437    
Vested RSUs (in shares) (3,386,415)    
Forfeited and expired (in shares) (541,295)    
Awards outstanding other than options, Ending balance (in shares) 16,055,542 17,303,815  
Restricted Stock Units, Weighted Average Grant Date Fair Value per Share      
Weighted-average grant date fair value, Beginning of period (in dollars per share) $ 35.24    
Weighted-average grant-date fair value, Granted (in dollars per share) 53.22 $ 44.71 $ 33.70
Weighted-average grant date fair value, Vested RSUs (in dollars per share) 33.72    
Weighted-average grant date fair value, Forfeited and expired (in dollars per share) 36.94    
Weighted-average grant date fair value, Ending of period (in dollars per share) $ 38.51 $ 35.24