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SHARE-BASED COMPENSATION - JD's Share incentive plan - (Details) - JD Employee Awards
¥ in Thousands
12 Months Ended
Jan. 01, 2019
$ / shares
Dec. 31, 2020
CNY (¥)
$ / shares
shares
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2019
CNY (¥)
shares
Dec. 31, 2018
CNY (¥)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense | ¥     ¥ 9,311 ¥ 12,896 ¥ 15,195
Unrecognized compensation expense | ¥   ¥ 12,489 ¥ 12,489    
Weighted average remaining service period     1 year 5 months 1 day    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Unvested at the beginning of the period (in shares) | shares     150,085    
Vested (in shares) | shares     (64,525)    
Unvested the end of the period (in shares) | shares     85,560 150,085  
Expected to vest | shares   85,560 85,560    
Weighted-average grant date fair value          
Unvested at the beginning of the period (in dollars per share)   ¥ 20.93      
Vested (in dollars per share)   20.93      
Unvested at the ending of the period (in dollars per share)   20.93      
Expected to vest (in dollars per share)   ¥ 20.93      
ASU 2018-07          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair value of the ordinary share (per share) $ 20.93