Employee benefit (Details) - CNY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
|
| Defined Contribution Pension And Other Postretirements Plan Disclosure [Abstract] | |||
| Employee benefit expenses | ¥ 14,220 | ¥ 12,659 | ¥ 10,848 |