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EMPLOYEE BENEFIT PLANS - Principal actuarial assumptions (Details) - CNY (¥)
¥ in Millions
Dec. 31, 2020
Dec. 31, 2019
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