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Share-Based Compensation - Stock Option Activities (Details) - Stock Option Plan - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock option activity, shares      
Stock options at the beginning of the period (in shares) 24,329    
Stock options, granted (in shares) 5,695    
Stock options, assumed (in shares) 9,575    
Stock options, exercised (in shares) (7,131)    
Stock options, forfeited (in shares) (972)    
Stock options, expired (in shares) (11)    
Stock options at the ending of the period (in shares) 31,485 24,329  
Stock options, vested and expected to vest (in shares) 27,849    
Stock options, exercisable (in shares) 12,991    
Weighted-average exercise price      
Stock options, weighted-average strike price at the beginning of the period (in dollars per share) $ 17.90    
Stock options, weighted-average exercise price, granted (in dollars per share) 39.41    
Stock options, weighted-average exercise price, assumed (in dollars per share) 32.73    
Stock options, weighted-average exercise price, exercised (in dollars per share) 14.75    
Stock options, weighted-average exercise price, forfeited (in dollars per share) 25.52    
Stock options, weighted-average exercise price, expired (in dollars per share) 10.54    
Stock options, weighted-average strike price at the end of the period (in dollars per share) 26.79 $ 17.90  
Stock options, weighted-average exercise price, vested and expected to vest (in dollars per share) 24.91    
Stock options, weighted-average exercise price, exercisable (in dollars per share) $ 15.79    
Stock options, weighted-average remaining contractual term 6 years 3 months 21 days    
Stock options, weighted-average remaining contractual term, vested and expected to vest 6 years 1 month 9 days    
Stock options, weighted-average remaining contractual term, exercisable 3 years 10 months 27 days    
Stock options, aggregate intrinsic value $ 388    
Stock options, aggregate intrinsic value, vested and expected to vest 372    
Stock options, aggregate intrinsic value, exercisable $ 264    
Performance-vesting restricted stock rights granted without an accounting grant date (shares) 700    
Stock options, intrinsic value of options exercised $ 161 $ 125 $ 117
Total grant date fair value of options vested 40 $ 19 $ 19
Share-based compensation, unrecognized compensation $ 88    
Share-based compensation, unrecognized compensation weighted-average period of recognition 1 year 8 months 22 days