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Deferred Revenue/Income - Roll forward (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Summary of reconciliation in the current reporting period related to carried-forward deferred revenue |  |  |
Deferred revenue/income-beginning of year | ¥ 6,202,276 | ¥ 4,996,043 | ¥ 3,561,890
Additions | 2,335,784 | 3,263,495 | 3,138,343
Recognition | (2,522,435) | (2,055,119) | (1,705,134)
Effects on foreign exchange adjustment | 4,305 | (2,143) | 944
Deferred revenue/income-end of year | ¥ 6,019,930 | ¥ 6,202,276 | ¥ 4,996,043

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