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Convertible Bonds (Details)
12 Months Ended
Sep. 27, 2019
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
$ / shares
Convertible senior notes          
Debt Instrument [Line Items]          
Principal amount $ 1,000,000,000        
Coupon Rate 0.00%        
Debt instrument purchasers over-allotment option $ 125,000,000        
Principal amount per conversion rate $ 1,000,000        
Trading days | ¥     40    
Initial conversion rate (ADS per US$1,000 principal amount) 23.4680        
Initial conversion price (per ADS) | $ / shares $ 42.61        
Effective interest rate 11.15%        
Gross proceeds from the issuance of the Notes   $ 1,000,000      
Debt issuance costs   15,680,000      
Principal amount of the liability   1,000,000,000      
Unamortized debt discount   253,651,000      
Net carrying amount of the liability | ¥       ¥ 5,206,682,000  
Carrying amount of the equity component   258,429,000      
Amortization of the discount   $ 20,703,000 ¥ 144,132,000    
Principal amount over a remaining period   2 years 9 months 2 years 9 months    
Convertible senior notes | Redemption one          
Debt Instrument [Line Items]          
Ordinary shares, par value | $ / shares   $ 0.000005      
Trading days | ¥     20    
Consecutive trading day | ¥     30    
Percentage of conversion price   130.00% 130.00%    
Convertible senior notes | Redemption two          
Debt Instrument [Line Items]          
Principal amount   $ 1,000,000      
Trading days | ¥     5    
Consecutive trading day | ¥     10    
Percentage of conversion price   98.00% 98.00%    
Class A ordinary shares          
Debt Instrument [Line Items]          
Ordinary shares, par value | $ / shares   $ 0.000005     $ 0.000005