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Principal Accounting Policies - Taxation (Details)
12 Months Ended
Mar. 16, 2007
Dec. 31, 2022
Principal Accounting Policies    
Withholding tax rate on dividend distributed by foreign investment entities to its non-resident enterprise investors (as a percent) 10.00% 10.00%
Lower withholding income tax rate on dividend applied, if the non-resident enterprise investor is registered in Hong Kong with at least 25% equity interest in the PRC enterprise and meets the relevant conditions or requirements (as a percent) 5.00% 5.00%
Minimum equity interest in PRC entities (as a percent) 25.00% 25.00%