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STATUTORY RESERVES AND RESTRICTED NET ASSETS - Condensed statements of cash flows of the parent company (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
STATUTORY RESERVES AND RESTRICTED NET ASSETS        
Net cash provided by operating activities ¥ (376,170) $ (53,794) ¥ 9,447,137 ¥ 11,414,244
Net cash provided by investing activities 5,894,327 842,878 (9,378,025) (3,977,440)
Net cash used in financing activities (9,793,199) (1,400,409) (5,794,635) (7,218,210)
Effect of exchange rate changes on cash and cash equivalents (82,585) (11,807) 169,476 44,608
Net increase (decrease) in cash, cash equivalents and restricted cash (4,357,627) (623,132) (5,556,047) 263,202
Cash and cash equivalents at the beginning of the year 11,442,965 1,636,322 19,634,716 19,413,202
Cash and cash equivalents at the end of the year 7,773,182 $ 1,111,550 11,442,965 19,634,716
Parent        
STATUTORY RESERVES AND RESTRICTED NET ASSETS        
Net cash provided by operating activities 131,872   194,920 62,063
Net cash provided by investing activities 9,950,599   7,749,040 6,933,723
Net cash used in financing activities (9,462,344)   (7,931,793) (6,576,333)
Effect of exchange rate changes on cash and cash equivalents (13,633)   18,834 (422,857)
Net increase (decrease) in cash, cash equivalents and restricted cash 606,494   31,001 (3,404)
Cash and cash equivalents at the beginning of the year 40,415   9,414 12,818
Cash and cash equivalents at the end of the year ¥ 646,909   ¥ 40,415 ¥ 9,414