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EMPLOYEE BENEFIT PLANS - Amounts recognized in the consolidated balance sheets (Details) - 12 months ended Dec. 31, 2020 ¥ in Millions, $ in Millions | CNY (¥) | USD ($) | USD ($)
--- | --- | --- | ---
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |
Salary and welfare payables | ¥ 8 |  |
Retirement benefit obligation | 179 |  | $ 27
Liability in the balance sheet | 187 |  |
Net amount recognized in accumulated other comprehensive loss | ¥ 27 | $ 4 |

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