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Share-based Compensation - Restricted Share Unit Award Activities -Table (Details) - 2009 Restricted Share Unit Plan and 2019 Restricted Share Unit Plan
$ / shares in Units, shares in Thousands, $ in Millions, ¥ in Billions
 12 Months Ended
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
$ / shares
shares
Dec. 31, 2021
$ / shares
shares
Dec. 31, 2023
CNY (¥)
Share based Compensation        
Total unrecognized compensation cost related to unvested awards $ 365.3     ¥ 2.6
Weighted average remaining vesting period over which unrecognized compensation cost is recognized 1 year 5 months 23 days      
Restricted share units        
Number of RSUs        
Outstanding at the beginning of the period (in shares) | shares 13,005 12,996 14,096  
Granted (in shares) | shares 4,795 5,335 4,579  
Vested (in shares) | shares (5,190) (4,630) (5,067)  
Forfeited (in shares) | shares (523) (696) (612)  
Outstanding at end of the period (in shares) | shares 12,087 13,005 12,996  
Weighted average grant date fair value        
Outstanding at the beginning of the period (in dollars per share) | $ / shares $ 82.67 $ 75.40 $ 57.85  
Granted (in dollars per share) | $ / shares 84.73 93.98 110.19  
Vested (in dollars per share) | $ / shares 76.27 75.01 58.02  
Forfeited (in dollars per share) | $ / shares 88.24 84.55 75.29  
Outstanding at the end of the period (in dollars per share) | $ / shares $ 86.00 $ 82.67 $ 75.40