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Accounts receivable, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Allowance for doubtful accounts        
Balance at beginning of the year ¥ (71,671) ¥ (1,770)    
Additions (324,270) (72,608)    
Reversals   868    
Write-offs 79,395 1,839    
Balance at end of the year ¥ (316,546) (71,671)    
Accounts receivable, net   2,436,256 $ 1,467,826 ¥ 9,508,284
Allowance for doubtful accounts of finance business   64,228   297,913
Online direct sales and online marketplace receivables        
Accounts receivable        
Accounts receivable, gross   2,043,243   8,939,054
Online payment processing transactions receivables        
Accounts receivable        
Accounts receivable, gross   182,412   385,547
Advertising receivables        
Accounts receivable        
Accounts receivable, gross   62,705   121,170
Others        
Accounts receivable        
Accounts receivable, gross   ¥ 219,567   ¥ 379,059