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Parent company only condensed financial information (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Condensed Financial Information Disclosure [Abstract]      
Dividend paid ¥ 59,933 ¥ 98,174 ¥ 75,355