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Gain on disposals of long-lived assets (Details) - CNY (¥)
¥ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Feb. 28, 2019
Feb. 27, 2019
Long lived asset, disposal gain loss [Line Items]        
Total gross asset value to be disposed to JD LPC Fund       ¥ 10,900,000
Gain on disposals of long-lived assets ¥ 3,070,297 ¥ 0    
Gain on disposals of completed assets to JD LPC Fund ¥ 3,000,000      
JD LPC Fund        
Long lived asset, disposal gain loss [Line Items]        
Total committed capital     ¥ 4,800,000  
JD LPC Fund | General partner        
Long lived asset, disposal gain loss [Line Items]        
Committed percentage of the total capital (as a percent)     20.00%  
JD LPC Fund | GIC        
Long lived asset, disposal gain loss [Line Items]        
Committed percentage of the total capital (as a percent)     80.00%