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Principal Accounting Policies - Statutory reserves, Dividends (Details)
¥ / shares in Units, $ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
¥ / shares
Statutory Reserves          
Appropriations to statutory reserves ¥ 1,000,000 $ 0.1 ¥ 6,400,000 ¥ 3,300,000  
Dividends          
Dividends declared   $ 100.0 ¥ 0 ¥ 0  
Dividends payable, per share | $ / shares   $ 0.1714      
ADS          
Dividends          
Dividends payable, per share | ¥ / shares         ¥ 1.3712
Wholly foreign-owned enterprise          
Statutory Reserves          
Portion of after-tax profit to be allocated to general reserve fund under PRC law (as a percent) 10.00% 10.00%      
Required general reserve/registered capital ratio to de-force compulsory net profit allocation to general reserve (as a percent) 50.00% 50.00%      
Domestically funded enterprises          
Statutory Reserves          
Portion of after-tax profit to be allocated to general reserve fund under PRC law (as a percent) 10.00% 10.00%      
Required general reserve/registered capital ratio to de-force compulsory net profit allocation to general reserve (as a percent) 50.00% 50.00%