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Summary of significant accounting policies (Details 3)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
item
Dec. 31, 2015
CNY (¥)
item
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
Revenue        
Online direct sales $ 25,891,658 ¥ 167,720,984,000 ¥ 108,549,258,000 ¥ 67,017,977,000
Customer incentives and loyalty programs        
Types of Discounted Coupons | item 2 2    
Fulfillment        
Shipping cost   ¥ 7,236,163,000 4,077,586,000 2,068,781,000
Marketing        
Advertising costs   5,721,216,000 2,780,642,000 1,491,467,000
Statutory reserves        
Appropriations of statutory reserves   40,551,000 12,361,000 810,000
Appropriations to other reserve funds   ¥ 0 0 0
PRC | General reserve fund | Foreign invested enterprise        
Statutory reserves        
Minimum portion of after tax profit to be allocated to general reserve under PRC law (as a percentage) 10.00% 10.00%    
Maximum percentage of statutory general reserve related to entity's registered capital 50.00% 50.00%    
PRC | Statutory surplus reserve | Domestic enterprise        
Statutory reserves        
Minimum portion of after tax profit to be allocated to statutory surplus under PRC law (as a percentage) 10.00% 10.00%    
Maximum percentage of statutory surplus reserve related to entity's registered capital 50.00% 50.00%    
Electronics and home appliance products        
Revenue        
Online direct sales   ¥ 134,346,243,000 90,890,026,000 56,814,078,000
General merchandise products        
Revenue        
Online direct sales   ¥ 33,374,741,000 ¥ 17,659,232,000 ¥ 10,203,899,000