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Principal Accounting Policies - Share-based compensation (Details) | 12 Months Ended
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Dec. 31, 2023
Share based Compensation |
Number of preceding years considered for estimating forfeiture | 5 years
2009 Restricted Share Unit Plan and 2019 Restricted Share Unit Plan | Restricted share units | Equal to or more than |
Share based Compensation |
Service vesting period | 1 year
2009 Restricted Share Unit Plan and 2019 Restricted Share Unit Plan | Restricted share units | Less than |
Share based Compensation |
Service vesting period | 5 years
Certain subsidiaries | Stock options | Equal to or more than |
Share based Compensation |
Expiration period | 4 years
Certain subsidiaries | Stock options | Less than |
Share based Compensation |
Expiration period | 7 years

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