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Condensed Financial Information of the Company - Statement of cash flows (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Statement of cash flows        
Net cash provided by operating activities $ 2,128,900 ¥ 14,820,976 ¥ 7,767,927 ¥ 9,686,328
Cash flows from investing activities:        
Proceeds from sales of short-term investments 3,561,957 24,797,630 50,000 1,633,000
Cash given to purchase of short term investments (7,534,202) (52,451,615) (7,516,370) (1,393,000)
Net cash provided by/(used in) investing activities (4,067,867) (28,319,678) (7,548,509) 71,651
Cash flows from financing activities:        
Proceeds from the initial public offering     11,879,944  
Costs incurred for the initial public offering costs     (356,313)  
Proceeds from follow-on offering 1,177,080 8,194,597    
Costs incurred for the issuance costs of follow-on offering 28,839 200,769    
Proceeds from issuance of convertible bonds 15,688 109,220    
Proceeds from issuance of convertible bonds 1,015,987 7,073,101    
Proceeds from issuance of convertible preferred shares     5,824,568 1,446,906
Costs incurred for the issuance of convertible preferred shares     (3,842) (15,369)
Repurchase of Class B Ordinary Shares       (32,677)
Net cash provided by financing activities 2,277,390 15,854,731 17,344,357 1,398,860
Exchange rate effect on cash, cash equivalents and restricted cash 64,659 450,142 546,910 (47,681)
Increase in cash, cash equivalents and restricted cash 403,082 2,806,171 18,110,685 11,109,158
Cash, cash equivalents and restricted cash at beginning of year 4,386,751 30,539,686 12,429,001 1,319,843
Cash, cash equivalents and restricted cash at end of year 4,789,833 33,345,857 30,539,686 12,429,001
Parent Company | Reportable legal entity        
Statement of cash flows        
Net cash provided by operating activities 37,262 259,409 110,724 2,753
Cash flows from investing activities:        
Proceeds from sales of short-term investments 868,969 6,049,590    
Cash given to purchase of short term investments (861,562) (5,998,024) (6,146,370)  
Cash given to subsidiaries, the VIE and subsidiaries of the VIE (2,914,926) (20,293,132) (6,749,831) (1,058,908)
Net cash provided by/(used in) investing activities (2,907,519) (20,241,566) (12,896,201) (1,058,908)
Cash flows from financing activities:        
Proceeds from the initial public offering     (11,879,944)  
Costs incurred for the initial public offering costs     (356,313)  
Proceeds from follow-on offering 1,177,080 8,194,597    
Costs incurred for the issuance costs of follow-on offering (28,839) (200,769)    
Proceeds from issuance of convertible bonds 1,015,987 7,073,101    
Proceeds from issuance of convertible bonds (15,275) (106,344)    
Proceeds from issuance of convertible preferred shares     5,824,568 1,446,906
Costs incurred for the issuance of convertible preferred shares     (3,842) (15,369)
Repurchase of Class B Ordinary Shares       (32,677)
Net cash provided by financing activities 2,148,953 14,960,585 17,344,357 1,398,860
Exchange rate effect on cash, cash equivalents and restricted cash 20,331 141,540 319,221 (47,820)
Increase in cash, cash equivalents and restricted cash (700,973) (4,880,032) 4,878,101 294,885
Cash, cash equivalents and restricted cash at beginning of year 796,022 5,541,746 663,645 368,760
Cash, cash equivalents and restricted cash at end of year $ 95,049 ¥ 661,714 ¥ 5,541,746 ¥ 663,645