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Accounts payable (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Accounts payable      
Vendor payable   ¥ 62,548,717 ¥ 38,216,484
Shipping charges payable and others   11,788,991 7,819,400
Total $ 11,425,497 ¥ 74,337,708 ¥ 46,035,884