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Fair value measurement (Details 2) - CNY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Short-term investments |  |  |
Gain (loss) from changes in fair value option | ¥ 1,485 | ¥ 2,092 | ¥ 1,921
Investment, Type [Extensible Enumeration] | Wealth Management Product [Member] | Wealth Management Product [Member] |

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