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EMPLOYEE BENEFIT PLANS - Amounts recognized in the consolidated balance sheets (Details) ¥ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2021 USD ($)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Salary and welfare payables | ¥ 8 |  | ¥ 8 |
Retirement benefit obligation | 144 |  | 179 | $ 23
Liability in the balance sheet | 152 |  | 187 |
Net amount recognized in accumulated other comprehensive loss | ¥ (13) | $ (2) | ¥ 27 |

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