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Accounts payable (Details)
¥ in Thousands, $ in Thousands
Sep. 30, 2019
CNY (¥)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Accounts payable      
Vendor payable ¥ 74,822,299   ¥ 66,701,380
Shipping charges payable and others 11,627,471   13,283,638
Total ¥ 86,449,770 $ 12,094,768 ¥ 79,985,018