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EMPLOYEE BENEFIT PLANS - Principal actuarial assumptions (Details) - CNY (¥) ¥ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Principal actuarial assumptions |  |
Inflation rate | 1.00% |
Future salary increases | 1.50% |
Future pension increases | 1.80% |
Fair value hierarchy of total plan assets measured at fair value by asset | ¥ 6 | ¥ 32
Expect to contribute | 1 |
Benefits expected to be paid in 2021 | ¥ 8 |
Germany |  |
Principal actuarial assumptions |  |
Discount rate | 0.33% |
Other |  |
Principal actuarial assumptions |  |
Discount rate | 0.12% |
Equity securities |  |
Principal actuarial assumptions |  |
Target asset allocation for the plan, as a percentage of total plan assets | 25.00% |
Debt securities |  |
Principal actuarial assumptions |  |
Target asset allocation for the plan, as a percentage of total plan assets | 30.00% |
Level 1 |  |
Principal actuarial assumptions |  |
Fair value hierarchy of total plan assets measured at fair value by asset | ¥ 6 |
Level 1 | Equity funds |  |
Principal actuarial assumptions |  |
Fair value hierarchy of total plan assets measured at fair value by asset | 1 |
Level 1 | Bond funds |  |
Principal actuarial assumptions |  |
Fair value hierarchy of total plan assets measured at fair value by asset | 2 |
Level 1 | Property |  |
Principal actuarial assumptions |  |
Fair value hierarchy of total plan assets measured at fair value by asset | 2 |
Level 1 | Other |  |
Principal actuarial assumptions |  |
Fair value hierarchy of total plan assets measured at fair value by asset | ¥ 1 |

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