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EMPLOYEE BENEFIT PLANS _ Change in Projected Benefit Obligations and Change in Plan Assets (Details) - CNY (¥)
¥ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Change in Projected Benefit Obligation    
Begin of the year ¥ 193 ¥ 147
Current service cost 5 5
Interest cost 0 1
Contributions by plan participants 1 1
Actuarial loss (gain) (14) 38
Foreign currency translation (19) 3
Benefits paid (9) (7)
Settlements   (1)
Administrative Expenses, Taxes and Premiums Paid 0 0
Curtailments   (1)
Acquisitions 0  
Effect of other economic events   7
End of the year 157 193
Change in Plan Assets    
Begin of the year 6 32
Actual return on plan assets 0 (2)
Foreign currency translation 0 1
Employer contributions 1 9
Employee contributions 0 1
Benefits paid (2) (8)
Acquisitions 0  
Other economic events   (27)
End of the year 5 6
Excess of defined benefit obligation over the fair value of plan assets 152 187
Accumulated benefit obligation ¥ 157 ¥ 193