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Share-based compensation (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based compensation      
Share-based compensation expenses ¥ 3,694,955 ¥ 3,659,989 ¥ 2,780,062
Cost of revenues      
Share-based compensation      
Share-based compensation expenses 82,243 71,983 27,513
Fulfillment      
Share-based compensation      
Share-based compensation expenses 440,167 418,895 425,706
Marketing      
Share-based compensation      
Share-based compensation expenses 258,860 190,499 135,749
Research and development      
Share-based compensation      
Share-based compensation expenses 1,340,317 1,162,579 670,612
General and administrative      
Share-based compensation      
Share-based compensation expenses ¥ 1,573,368 ¥ 1,816,033 ¥ 1,520,482