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Business acquisition - Summary of purchase price as of the date of dada acquisition (Details) - Dada Acquisition [Member]
¥ in Millions
Feb. 28, 2022
CNY (¥)
Summary of purchase price as of the date of acquisition [Line Items]  
Cash ¥ 3,452
Business cooperation agreement as consideration of the acquisition 1,606
Fair value of previously held equity interests 5,702
Total ¥ 10,760