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Subsequent events (Details)
12 Months Ended 24 Months Ended
Apr. 16, 2021
USD ($)
shares
Mar. 22, 2021
USD ($)
Jun. 05, 2020
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Mar. 31, 2021
CNY (¥)
Mar. 10, 2021
USD ($)
Subsequent events                  
Shares repurchased during the year | ¥       ¥ 311,776,000 ¥ 131,010,000 ¥ 205,886,000      
Dada Group                  
Subsequent events                  
Non controlling interest ownership percentage   51.00% 48.00% 46.00%          
Total consideration in cash   $ 800,000,000 ¥ 425,066,000 ¥ 277,789,000     ¥ 2,282,520,000    
Subsequent event | ADS                  
Subsequent events                  
Shares repurchased during the year | $ $ 669,970,000                
Treasury Stock, Shares, Acquired | shares 8,775,180                
Subsequent event | JD Digits [Member] | Cloud Computing And Artificial Intelligence Business [Member]                  
Subsequent events                  
Disposal group discontinued operation consideration receivable | ¥               ¥ 15,700,000,000  
Subsequent event | JD Digits [Member] | Jingdong Century | Cloud Computing And Artificial Intelligence Business [Member] | Maximum [Member]                  
Subsequent events                  
Non controlling interest ownership percentage               42.00%  
Subsequent event | JD Digits [Member] | Jingdong Century | Cloud Computing And Artificial Intelligence Business [Member] | Minimum [Member]                  
Subsequent events                  
Non controlling interest ownership percentage               36.80%  
Subsequent event | Jingdong Property [Member] | Series A Preferred Stock [Member] | Non Redeemable Series A Preferred Stock Agreement [Member]                  
Subsequent events                  
Preferred stock value issued but not subscribed | $                 $ 700,000,000