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Accounts receivable, net (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Accounts receivable            
Accounts receivable         ¥ 16,413,128,000 ¥ 16,178,000,000
Allowance for doubtful accounts ¥ (36,993,000) ¥ (38,633,000) ¥ (27,108,000)   (53,981,000) (36,993,000)
Accounts receivable, net       $ 2,514,355 16,359,147,000 16,141,007,000
Movements in the allowance for doubtful accounts            
Balance at beginning of the year (36,993,000) (38,633,000) (27,108,000)      
Additions (16,988,000)   (11,525,000)      
Reverse   1,640,000        
Balance at end of the year (53,981,000) (36,993,000) (38,633,000)      
Product sales and online marketplace receivables            
Accounts receivable            
Accounts receivable         14,819,862,000 15,636,019,000
Advertising receivables            
Accounts receivable            
Accounts receivable         572,495,000 179,498,000
Logistic services            
Accounts receivable            
Accounts receivable         ¥ 1,020,771,000 ¥ 362,483,000
Consumer financing receivable            
Movements in the allowance for doubtful accounts            
Additions ¥ 0 ¥ 0 ¥ 0