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SHARE-BASED COMPENSATION - Share options activities (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2025 CNY (¥) shares | Dec. 31, 2025 USD ($) $ / shares shares | Dec. 31, 2024 CNY (¥) shares | Dec. 31, 2024 USD ($) $ / shares shares | Dec. 31, 2023 CNY (¥) shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures |  |  |  |  |  |  |
Share-based compensation related to share options | ¥ | ¥ 1,904,924 |  | ¥ 2,726,075 |  | ¥ 3,215,549 |  |
Share options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures |  |  |  |  |  |  |
Aggregate intrinsic value of share options exercised | $ |  | $ 102,400 |  | $ 72,800 |  | $ 92,800 |
Share-based compensation related to share options | ¥ | ¥ 138,456 |  | ¥ 541,956 |  | ¥ 771,151 |  |
2018 Share Option Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding |  |  |  |  |  |  |
Number of options Outstanding beginning | 25,843,947 | 25,843,947 | 40,349,583 | 40,349,583 | 59,822,418 | 59,822,418 |
Granted (in shares) | 0 | 0 | 0 | 0 | 0 | 0 |
Exercised (in shares) | (15,577,452) | (15,577,452) | (14,183,427) | (14,183,427) | (17,029,713) | (17,029,713) |
Forfeited or Cancelled or Lapsed (in shares) | (89,151) | (89,151) | (322,209) | (322,209) | (2,443,122) | (2,443,122) |
Number of options Outstanding ending | 10,177,344 | 10,177,344 | 25,843,947 | 25,843,947 | 40,349,583 | 40,349,583 | 59,822,418
Vested and exercisable (in shares) |  | 6,653,786 |  | 6,682,319 |  | 7,610,018 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price |  |  |  |  |  |  |
Weighted Average Exercise Price, outstanding beginning | $ / shares |  | $ 0.00002 |  | $ 0.00002 |  | $ 0.00002 |
Weighted Average Exercise Price, exercised | $ / shares |  | 0.00002 |  | 0.00002 |  | 0.00002 |
Weighted Average Exercise Price, forfeited or cancelled or lapsed | $ / shares |  | 0.00002 |  | 0.00002 |  | 0.00002 |
Weighted Average Exercise Price, outstanding ending | $ / shares |  | 0.00002 |  | 0.00002 |  | 0.00002 | $ 0.00002
Weighted Average Exercise Price, Vested and exercisable | $ / shares |  | $ 0.00002 |  | $ 0.00002 |  | $ 0.00002 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures |  |  |  |  |  |  |
Weighted Average Remaining Contractual Life outstanding | 4 years 9 months 3 days | 4 years 9 months 3 days | 5 years 5 months 19 days | 5 years 5 months 19 days | 6 years 4 months 20 days | 6 years 4 months 20 days | 7 years 3 months 18 days
Weighted Average Remaining Contractual Life | 4 years 5 months 12 days | 4 years 5 months 12 days | 5 years 3 months 18 days | 5 years 3 months 18 days | 5 years 9 months 21 days | 5 years 9 months 21 days |
Aggregate Intrinsic Value, Outstanding | $ |  | $ 53,465 |  | $ 158,682 |  | $ 218,022 | $ 278,373
Aggregate Intrinsic Value, Vested and exercisable | $ |  | $ 34,954 |  | $ 41,029 |  | $ 41,119 |

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