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Share-based compensation (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based compensation      
Share-based compensation expenses ¥ 9,134 ¥ 4,156 ¥ 3,695
Cost of revenues      
Share-based compensation      
Share-based compensation expenses 102 98 82
Fulfillment      
Share-based compensation      
Share-based compensation expenses 882 646 440
Marketing      
Share-based compensation      
Share-based compensation expenses 586 347 259
Research and development      
Share-based compensation      
Share-based compensation expenses 1,781 1,400 1,340
General and administrative      
Share-based compensation      
Share-based compensation expenses ¥ 5,783 ¥ 1,665 ¥ 1,574