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Share-based Compensation (Details 3) - 2009 Plan and 2019 Plan
$ / shares in Units, shares in Thousands, ¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2021
CNY (¥)
Share based Compensation        
Total unrecognized compensation cost related to unvested awards $ 416.7     ¥ 2,655.6
Weighted average remaining vesting period over which unrecognized compensation cost is recognized 2 years 2 months 15 days      
Restricted share units        
Number of RSUs        
Outstanding at the beginning of the period (in shares) | shares 14,096 14,075 12,125  
Granted (in shares) | shares 4,579 6,269 8,815  
Vested (in shares) | shares (5,067) (5,832) (5,910)  
Forfeited (in shares) | shares (612) (416) (955)  
Outstanding at end of the period (in shares) | shares 12,996 14,096 14,075  
Weighted average grant date fair value        
Outstanding at the beginning of the period (in dollars per share) | $ / shares $ 57.85 $ 49.00 $ 52.02  
Granted during the year (in dollars per share) | $ / shares 110.19 68.35 46.30  
Vested during the year (in dollars per share) | $ / shares 58.02 48.02 51.22  
Forfeited during the year (in dollars per share) | $ / shares 75.29 54.47 48.82  
Outstanding at the end of the period (in dollars per share) | $ / shares $ 75.40 $ 57.85 $ 49.00