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Accounts payable (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Accounts payable      
Vendor payable   ¥ 66,701,380 ¥ 62,548,717
Shipping charges payable and others   13,283,638 11,788,991
Total $ 11,633,338 ¥ 79,985,018 ¥ 74,337,708