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Principal activities and organization (Details 2)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2015
CNY (¥)
VIEs and VIEs' subsidiaries            
Total assets $ 30,421,766   ¥ 184,054,966,000   ¥ 209,164,857,000  
Total liabilities 19,247,578   131,666,263,000   132,336,713,000  
Total net revenues 67,197,987 ¥ 462,019,759,000 362,331,754,000 ¥ 258,289,947,000    
Net cash provided by/(used in) operating activities 3,037,077 20,881,422,000 26,856,727,000 8,240,371,000    
Net cash used in investing activities (3,793,032) (26,078,992,000) (39,815,291,000) (45,481,435,000)    
Net cash provided by financing activities 1,631,871 11,219,928,000 19,234,985,000 40,699,471,000    
Net increase/(decrease) in cash, cash equivalents, and restricted cash 1,120,431 7,703,521,000 5,634,887,000 4,184,869,000    
Cash, cash equivalents, and restricted cash at beginning of year 4,334,017 29,798,537,000 24,163,650,000 19,978,781,000    
Cash, cash equivalents, and restricted cash at end of year 5,454,448 37,502,058,000 29,798,537,000 24,163,650,000    
Total shareholders' deficit of the Group's VIEs and VIEs' subsidiaries $ 8,852,716   52,388,703,000 34,162,862,000 60,866,860,000 ¥ 30,720,866,000
VIEs and their subsidiaries            
VIEs and VIEs' subsidiaries            
Total assets     19,281,227,000   23,878,253,000  
Total liabilities     19,547,831,000   26,717,946,000  
Total net revenues   37,561,128,000 15,926,297,000 4,338,450,000    
Net loss   (2,646,122,000) (115,318,000) (8,366,000)    
Net cash provided by/(used in) operating activities   (1,144,849,000) 1,188,220,000 118,007,000    
Net cash used in investing activities   (7,596,181,000) (10,117,516,000) (4,708,901,000)    
Net cash provided by financing activities   8,902,074,000 9,626,497,000 4,499,914,000    
Net increase/(decrease) in cash, cash equivalents, and restricted cash   161,044,000 697,201,000 (90,980,000)    
Cash, cash equivalents, and restricted cash at beginning of year   719,160,000 21,959,000 112,939,000    
Cash, cash equivalents, and restricted cash at end of year   ¥ 880,204,000 719,160,000 ¥ 21,959,000    
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         1,067,537,000  
Total shareholders' deficit of the Group's VIEs and VIEs' subsidiaries     ¥ 266,604,000   ¥ 2,839,693,000