General information and organization - Additional Information (Details) - CNY (¥) ¥ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| VIEs And Subsidiaries Of VIEs [Member] | ||
| General Information Organization And Basis Of Preparation [Line Items] | ||
| Capital reserve and statutory reserves | ¥ 11,612 | ¥ 11,983 |