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Short-term and Long-term deposits (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Shortterm and Longterm deposits [Line Items]        
Short-term deposits ¥ 7,326,996 $ 1,065,667 ¥ 6,000,104  
RMB [Member]        
Shortterm and Longterm deposits [Line Items]        
Short-term deposits 2,100,000   3,400,000  
Long-term deposits 1,000,000   0  
US$ [Member]        
Shortterm and Longterm deposits [Line Items]        
Short-term deposits ¥ 5,226,996 $ 761,573 ¥ 2,600,104 $ 397,816