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EMPLOYEE BENEFIT PLANS - Amounts recognized in the consolidated balance sheets (Details) ¥ in Millions, $ in Millions | Dec. 31, 2025 CNY (¥) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 CNY (¥)
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Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |
Salary and welfare payables | ¥ 10 |  | ¥ 9
Retirement benefit obligation | 109 | $ 16 | 111
Liability in the balance sheet | ¥ 119 |  | ¥ 120

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