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Principal activities and organization (Details 2)
$ in Thousands
 1 Months Ended 12 Months Ended
Jan. 31, 2016
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2017
CNY (¥)
VIEs and VIEs' subsidiaries            
Total assets   $ 28,288,732   ¥ 160,373,518,000   ¥ 184,054,966,000
Total liabilities   20,236,735   119,153,735,000   131,666,263,000
Total net revenues   55,689,371 ¥ 362,331,754,000 258,289,947,000 ¥ 181,042,300,000  
Net cash provided by/(used in) operating activities   3,814,960 24,821,273,000 8,767,017,000 1,696,322,000  
Net cash used in investing activities   (5,763,351) (37,498,092,000) (48,268,577,000) (5,790,525,000)  
Net cash provided by financing activities   2,956,363 19,234,985,000 40,699,471,000 4,700,273,000  
Net increase/(decrease) in cash and cash equivalents   909,370 5,916,632,000 1,907,827,000 949,217,000  
Cash and cash equivalents at beginning of year ¥ 17,863,868,000 3,038,854 19,771,695,000 17,863,868,000 16,914,651,000  
Cash and cash equivalents at end of year   3,948,224 25,688,327,000 19,771,695,000 17,863,868,000  
Redemption value accretion of the mezzanine equity     281,021,000 444,657,000 0  
Registered capitals and PRC statutory reserves of the Group's consolidated VIEs   58   377,000   377,000
Total shareholders' deficit of the Group's VIEs and VIEs' subsidiaries   $ (3,417,397)   (21,860,345,000)   (22,234,609,000)
VIEs and their subsidiaries            
VIEs and VIEs' subsidiaries            
Total assets       6,729,295,000   19,281,227,000
Total liabilities       6,978,241,000   19,547,831,000
Total net revenues     15,926,297,000 4,338,450,000 3,100,744,000  
Net loss     (115,318,000) (8,366,000) (214,011,000)  
Net cash provided by/(used in) operating activities     1,188,220,000 118,007,000 (445,200,000)  
Net cash used in investing activities     (10,117,516,000) (4,708,901,000) (58,135,000)  
Net cash provided by financing activities     9,626,497,000 4,499,914,000 518,019,000  
Net increase/(decrease) in cash and cash equivalents     697,201,000 (90,980,000) 14,684,000  
Cash and cash equivalents at beginning of year 112,939,000   21,959,000 112,939,000 98,255,000  
Cash and cash equivalents at end of year     ¥ 719,160,000 21,959,000 ¥ 112,939,000  
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           1,035,877,000
Total shareholders' deficit of the Group's VIEs and VIEs' subsidiaries       ¥ 248,946,000   ¥ 266,604,000
JD Finance            
VIEs and VIEs' subsidiaries            
Ordinary shares with preferential rights issued ¥ 6,650,000,000