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Supplier finance programs - Discount to financial institutions on behalf of suppliers (Details) - CNY (¥) ¥ in Millions | Mar. 31, 2025 | Mar. 31, 2024
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Supplier Finance Program [Line Items] |  |
Supplier finance program, obligation | ¥ 6,075 | ¥ 2,302
Accrued expenses, accounts payable and other liabilities |  |
Supplier Finance Program [Line Items] |  |
Supplier finance program, obligation | 1,605 | 2,302
Bank borrowings |  |
Supplier Finance Program [Line Items] |  |
Supplier finance program, obligation | ¥ 4,470 | ¥ 0

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