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Share-based Compensation - Restricted Share Units Plan (Details)
$ in Millions, ¥ in Billions
1 Months Ended 12 Months Ended
Nov. 17, 2009
Oct. 31, 2019
shares
Dec. 31, 2024
USD ($)
Dec. 31, 2024
CNY (¥)
Nov. 30, 2009
shares
Share based Compensation          
Number of preceding years considered for estimating forfeiture     5 years    
2009 Restricted Share Unit Plan          
Share based Compensation          
Number of ordinary shares reserved for issuance under the plan         323,694,050
Term of plan 10 years        
2019 Restricted Share Unit Plan          
Share based Compensation          
Number of ordinary shares reserved for issuance under the plan   322,458,300      
Term of plan   10 years      
Total unrecognized compensation cost related to unvested awards     $ 402.1 ¥ 2.9  
Weighted average remaining vesting period over which unrecognized compensation cost is recognized     1 year 5 months 8 days