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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
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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

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