Summary of Significant Accounting Policies - Impairment of long-lived assets other than goodwill and Advertising expenditures and incentive programs (Details) ¥ in Thousands, $ in Thousands |
12 Months Ended | |||
|---|---|---|---|---|
|
Dec. 31, 2025
CNY (¥)
|
Dec. 31, 2025
USD ($)
|
Dec. 31, 2024
CNY (¥)
|
Dec. 31, 2023
CNY (¥)
|
|
| Summary of Significant Accounting Policies | ||||
| Impairment of any long-lived assets | ¥ 0 | ¥ 0 | ¥ 0 | |
| Advertising expenditures recognized in sales and marketing expenses | 74,925,712 | $ 10,714,234 | 68,474,437 | 56,415,274 |
| Incentive programs recognized in sales and marketing expenses | ¥ 42,348,670 | $ 6,055,779 | ¥ 35,843,202 | ¥ 20,013,537 |