v3.25.2
DEBT - Bank borrowings (Details)
€ in Millions, ¥ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2024
EUR (€)
Aug. 31, 2022
CNY (¥)
Jun. 30, 2025
CNY (¥)
Jun. 30, 2025
EUR (€)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Jun. 30, 2025
EUR (€)
Aug. 31, 2022
EUR (€)
Debt                    
Long-term debt | ¥     ¥ 777   ¥ 4,546          
Euro                    
Debt                    
Percentage points added to the reference rate   1.55%                
RMB | Minimum                    
Debt                    
Percentage points added to the reference rate   0.15%                
RMB | Maximum                    
Debt                    
Percentage points added to the reference rate   0.20%                
Bank borrowings entered in August 2022                    
Debt                    
Interest rate (as a percent)     3.15%   3.15%       3.15%  
Repayment of line of credit facility             € 70 € 220    
Long-term facility entered in August 2022                    
Debt                    
Maximum borrowing amount                   € 220
Term of debt instrument   3 years                
Credit facility drawn down amount               220    
Term facility entered in August 2022 | RMB                    
Debt                    
Maximum borrowing amount | ¥   ¥ 110                
Credit facility drawn down amount               110    
Repayment of line of credit facility       € 3   € 5 € 6      
Revolving credit facility entered in August 2022                    
Debt                    
Maximum borrowing amount                   € 70
Term of debt instrument   35 months                
Credit facility drawn down amount               € 70    
Syndicated loan contract entered in march 2024                    
Debt                    
Maximum borrowing amount € 400                  
Term of debt instrument 5 years                  
Percentage points added to the reference rate     0.55% 0.55%            
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]     us-gaap:PrimeRateMember us-gaap:PrimeRateMember            
Interest rate (as a percent)     2.55%   2.90%       2.55%  
Credit facility drawn down amount | ¥         ¥ 340          
Repayment of line of credit facility | ¥     ¥ 15   15          
Utilizing revolving facility | ¥     310   ¥ 325          
Syndicated loan contract entered in march 2024 | Buildings                    
Debt                    
Amount pledged as collateral for the loan                 € 497  
Syndicated loan contract entered in march 2024 | Land use rights                    
Debt                    
Amount pledged as collateral for the loan                 € 68  
Revolving and term loans | Uncommitted short-term loan facility                    
Debt                    
Maximum borrowing amount | ¥     ¥ 4,074              
Term of debt instrument     1 year 1 year            
Credit facility drawn down amount | ¥     ¥ 2,195              
Revolving and term loans | Minimum | Uncommitted short-term loan facility                    
Debt                    
Interest rate (as a percent)     2.00%           2.00%  
Revolving and term loans | Maximum | Uncommitted short-term loan facility                    
Debt                    
Interest rate (as a percent)     2.65%           2.65%  
Revolving and term loans | Deposits | Uncommitted short-term loan facility                    
Debt                    
Amount pledged as collateral for the loan | ¥     ¥ 2,209