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Summary of significant accounting policies (Details 2)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Other investments      
Other short term investments $ 1,550,759 ¥ 10,766,920,000  
Other long term investments $ 1,007,839 6,997,425,000 ¥ 0
Lower yield investments sold to the third-party investors recorded as accrued expenses and other current liabilities   18,106,270,000 0
Nonrecourse securitization debt      
Collateralized accounts receivables and loans   ¥ 17,339,490,000 ¥ 4,320,000,000
Nonrecourse securitization debt      
Nonrecourse securitization debt      
Weighted average interest rate 4.39% 4.39% 5.30%
Minimum      
Land use rights, net      
Estimated useful lives (in years) 34 years    
Maximum      
Land use rights, net      
Estimated useful lives (in years) 70 years    
JD Finance      
Other investments      
Other short term investments   ¥ 10,766,920,000 ¥ 0
Domain names      
Intangible assets, net      
Estimated useful lives (in years) 10 years    
Trademarks | Minimum      
Intangible assets, net      
Estimated useful lives (in years) 7 years    
Trademarks | Maximum      
Intangible assets, net      
Estimated useful lives (in years) 20 years    
Copyrights | Minimum      
Intangible assets, net      
Estimated useful lives (in years) 2 years    
Copyrights | Maximum      
Intangible assets, net      
Estimated useful lives (in years) 5 years