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Summary of significant accounting policies- Others (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Statutory reserves      
Percentage of after-tax profit from subsidiaries incorporated in the PRC required to be appropriated to the statutory reserves 10.00%    
Limit of statutory reserve fund as a percentage of registered capital, after which allocations to statutory reserve fund are no longer required 50.00%    
Appropriation to the enterprise expansion fund and staff welfare and bonus fund ¥ 0    
Interest income from interest-earning assets 24,868 ¥ 16,339 ¥ 13,602
PRC      
Statutory reserves      
Appropriation to statutory reserves ¥ 1,756 ¥ 3,138 ¥ 2,492
Minimum      
Derivatives and hedging      
Ratio determining effective hedging relationship 80.00%    
Maximum      
Derivatives and hedging      
Ratio determining effective hedging relationship 125.00%