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ORDINARY SHARES - Share repurchase program (Details)
$ / shares in Units, ¥ in Thousands, $ in Millions
 1 Months Ended 12 Months Ended 38 Months Ended 43 Months Ended
May 31, 2022
USD ($)
Dec. 31, 2025
CNY (¥)
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
CNY (¥)
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
CNY (¥)
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Oct. 31, 2025
shares
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
$ / shares
shares
Aug. 12, 2022
$ / shares
Ordinary shares                      
Repurchase of ordinary shares | ¥   ¥ (6,581,195)   ¥ (5,101,091)   ¥ (5,150,628)          
Ordinary shares par value (in dollars per share) | $ / shares     $ 0.00002   $ 0.00002         $ 0.00002  
Treasury shares                      
Ordinary shares                      
Repurchase of ordinary shares (in shares)   (150,367,893) (150,367,893) (144,663,195) (144,663,195) (141,064,215) (141,064,215)        
Repurchase of ordinary shares   ¥ (6,581,200) $ (921.5) ¥ (5,101,091) $ (716.0) ¥ (5,150,628) $ (723.2)   ¥ (18,152,000) $ (2,548.0)  
Cancellation of ordinary shares (in shares)   (149,704,635) (149,704,635) (147,784,335) (147,784,335) (123,459,369) (123,459,369)        
ADSs and/or Class A ordinary shares                      
Ordinary shares                      
Repurchase of share authorization | $ $ 1,000.0   $ 5,000.0   $ 5,000.0   $ 5,000.0     $ 5,000.0  
Expiration date for purchase of share under share repurchase plan May 31, 2023 Aug. 31, 2028 Aug. 31, 2028 Aug. 31, 2028 Aug. 31, 2028 Aug. 31, 2028 Aug. 31, 2028        
Class A ordinary shares                      
Ordinary shares                      
Cancellation of ordinary shares (in shares)   149,704,635 149,704,635 147,784,335 147,784,335 123,459,369 123,459,369 456,194,967      
Ordinary shares par value (in dollars per share) | $ / shares     $ 0.00002   $ 0.00002   $ 0.00002     $ 0.00002 $ 0.00002
Share repurchase program     477,803,217             477,803,217