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Property and equipment, net (Details)
¥ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2025
CNY (¥)
Mar. 31, 2024
CNY (¥)
Mar. 31, 2023
CNY (¥)
Mar. 31, 2025
USD ($)
Property and equipment, net        
Property, Plant and Equipment, Gross ¥ 331,765 ¥ 315,634    
Less: accumulated depreciation and impairment (128,417) (130,473)    
Net book value 203,348 185,161   $ 28,022
Depreciation        
Depreciation 24,515 23,344 ¥ 24,654  
Building, property improvements and other property        
Property and equipment, net        
Property, Plant and Equipment, Gross 104,600 135,132    
Computer equipment and software        
Property and equipment, net        
Property, Plant and Equipment, Gross 157,252 117,458    
Construction in progress        
Property and equipment, net        
Property, Plant and Equipment, Gross 54,849 42,677    
Furniture, office and transportation equipment and others        
Property and equipment, net        
Property, Plant and Equipment, Gross ¥ 15,064 ¥ 20,367