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Share-based compensation (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-based compensation      
Share-based compensation expenses ¥ 4,804 ¥ 7,548 ¥ 9,134
Share Incentive Plan | Employee and non-employee      
Share-based compensation      
Number of ordinary shares available for future grants 223,666,717    
Cost of revenues      
Share-based compensation      
Share-based compensation expenses ¥ 133 143 102
Fulfillment      
Share-based compensation      
Share-based compensation expenses 697 930 882
Marketing      
Share-based compensation      
Share-based compensation expenses 426 631 586
Research and development      
Share-based compensation      
Share-based compensation expenses 859 1,557 1,781
General and administrative      
Share-based compensation      
Share-based compensation expenses ¥ 2,689 ¥ 4,287 ¥ 5,783