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Accounts receivable, net (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Accounts receivable            
Accounts receivable         ¥ 11,288,381,000 ¥ 16,413,128,000
Allowance for doubtful accounts ¥ (53,981,000) ¥ (36,993,000) ¥ (38,633,000)   (178,393,000) (53,981,000)
Accounts receivable, net       $ 1,615,881 11,109,988,000 16,359,147,000
Movements in the allowance for doubtful accounts            
Balance at beginning of the year (53,981,000) (36,993,000) (38,633,000)      
Additions (124,412,000) (16,988,000)        
Reverse     1,640,000      
Balance at end of the year (178,393,000) (53,981,000) (36,993,000)      
Online direct sales and online marketplace receivables            
Accounts receivable            
Accounts receivable         7,756,808,000 14,819,862,000
Advertising receivables            
Accounts receivable            
Accounts receivable         534,410,000 572,495,000
Logistics services            
Accounts receivable            
Accounts receivable         ¥ 2,997,163,000 ¥ 1,020,771,000
Consumer financing receivables            
Movements in the allowance for doubtful accounts            
Additions ¥ 0 ¥ 0 ¥ 0