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EMPLOYEE BENEFIT PLANS - Principal actuarial assumptions (Details) - CNY (¥) ¥ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Principal actuarial assumptions
Inflation rate	1.00%	1.00%
Future salary increases	2.17%	1.50%
Future pension increases	1.69%	1.80%
Fair value hierarchy of total plan assets measured at fair value by asset	¥ 5	¥ 6	¥ 32
Expect to contribute	1
Benefits expected to be paid in 2022	¥ 9
Germany
Principal actuarial assumptions
Discount rate	0.89%	0.33%
Other
Principal actuarial assumptions
Discount rate	0.39%	0.12%
Equity securities
Principal actuarial assumptions
Target asset allocation for the plan, as a percentage of total plan assets	26.00%
Debt securities
Principal actuarial assumptions
Target asset allocation for the plan, as a percentage of total plan assets	29.00%
Quoted Prices in Active Markets for Identical Assets (Level 1)
Principal actuarial assumptions
Fair value hierarchy of total plan assets measured at fair value by asset	¥ 5	¥ 6
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity funds
Principal actuarial assumptions
Fair value hierarchy of total plan assets measured at fair value by asset	1	1
Quoted Prices in Active Markets for Identical Assets (Level 1) | Bond funds
Principal actuarial assumptions
Fair value hierarchy of total plan assets measured at fair value by asset	2	2
Quoted Prices in Active Markets for Identical Assets (Level 1) | Property
Principal actuarial assumptions
Fair value hierarchy of total plan assets measured at fair value by asset	1	2
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other
Principal actuarial assumptions
Fair value hierarchy of total plan assets measured at fair value by asset	¥ 1	¥ 1

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- Definition

Weighted average rate for inflation, used to determine benefit obligation of defined benefit plan.

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Weighted average rate of future pension increases, used to determine benefit obligation of defined benefit plan.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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