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Principal activities and organization (Details 2)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2016
CNY (¥)
VIEs and VIEs' subsidiaries            
Total assets $ 37,306,977   ¥ 209,164,857,000 ¥ 184,054,966,000 ¥ 259,723,704,000  
Total liabilities 22,853,210   132,336,713,000 131,666,263,000 159,099,473,000  
Total net revenues 82,864,846 ¥ 576,888,484,000 462,019,759,000 362,331,754,000    
Net income/(loss) 1,707,904 11,890,092,000 (2,800,550,000) (11,718,000)    
Net cash provided by/(used in) operating activities 3,559,600 24,781,220,000 20,881,422,000 26,856,727,000    
Net cash used in investing activities (3,641,208) (25,349,357,000) (26,078,992,000) (39,815,291,000)    
Net cash provided by financing activities 369,512 2,572,467,000 11,219,928,000 19,234,985,000    
Net increase/(decrease) in cash, cash equivalents, and restricted cash 346,206 2,410,221,000 7,703,521,000 5,634,887,000    
Total shareholders' deficit of the Group's VIEs and VIEs' subsidiaries $ 12,160,627   60,866,860,000 52,388,703,000 84,659,847,000 ¥ 34,162,862,000
VIEs and their subsidiaries            
VIEs and VIEs' subsidiaries            
Total assets     23,878,253,000 19,281,227,000 38,749,631,000  
Total liabilities     26,717,946,000 19,547,831,000 43,734,593,000  
Total net revenues   59,306,001,000 37,561,128,000 15,926,297,000    
Net income/(loss)   (2,268,090,000) (2,646,122,000) (115,318,000)    
Net cash provided by/(used in) operating activities   953,673,000 (1,144,849,000) 1,188,220,000    
Net cash used in investing activities   (6,450,150,000) (7,596,181,000) (10,117,516,000)    
Net cash provided by financing activities   5,542,926,000 8,902,074,000 9,626,497,000    
Net increase/(decrease) in cash, cash equivalents, and restricted cash   46,449,000 161,044,000 697,201,000    
Cash, cash equivalents, and restricted cash at beginning of the year   880,204,000 719,160,000 21,959,000    
Cash, cash equivalents, and restricted cash at end of the year   ¥ 926,653,000 880,204,000 719,160,000    
Asset in the Group's VIEs and VIEs' subsidiaries that can be used only to settle their obligations except for registered capitals         0  
Registered capitals and PRC statutory reserves of the Group's consolidated VIEs         1,090,876,000  
Total shareholders' deficit of the Group's VIEs and VIEs' subsidiaries     ¥ 2,839,693,000 ¥ 266,604,000 ¥ 4,984,962,000