v3.26.1
INCOME TAXES - Valuation allowance (Details)
€ in Millions, ¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2026
CNY (¥)
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2025
EUR (€)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Uncertain tax benefits            
Interest or penalty expense   ¥ 0.0     ¥ 0.0 ¥ 0.0
Roll-forward of the unrecognized tax benefits            
Balance at the beginning of the year ¥ 90.0 85.0     67.0 65.0
Addition for tax positions   5.0     18.0 2.0
Balance at the end of the year   ¥ 90.0     ¥ 85.0 67.0
Withholding income tax rate (in %)   10.00% 10.00% 10.00%    
Withholding income tax rate with Hong Kong as holding company (in %)   5.00% 5.00% 5.00%    
Percentage holding of the PRC company (in %)   25 25 25    
PRC dividend withholding tax accrued   ¥ 322.0       ¥ 75.0
Percentage of dividend distribution on current year net income           45.00%
Minimum percentage of sole discretion and distribute ordinary dividends         60.00%  
Provision for dividend withholding tax accrued   ¥ 0.0        
Period of statute of limitations (in years)   3 years 3 years 3 years    
Period of statute of limitations, if the underpayment is more than the specified amount (in years)   5 years 5 years 5 years    
Minimum amount of underpayment of taxes for statute of limitations to be extended to five years   ¥ 0.1        
Period of statute of limitations for transfer pricing issues (in years)   10 years 10 years 10 years    
Tax paid by large multination enterprises   15.00% 15.00% 15.00%    
Revenues   ¥ 25,307.0 $ 3,618 € 750 ¥ 23,891.0 ¥ 21,882.0
Forecast            
Roll-forward of the unrecognized tax benefits            
Tax liability reduction due to unrecognized tax benefits ¥ 0.2          
GERMANY            
Valuation allowance            
Tax loss carryforwards   2,720.0        
Roll-forward of the unrecognized tax benefits            
Revenues   3,400.0     3,544.0 3,324.0
CHINA            
Valuation allowance            
Tax loss carryforwards, expire between 2026 and 2030   1,734.0        
Roll-forward of the unrecognized tax benefits            
Revenues   ¥ 20,499.0     ¥ 18,984.0 ¥ 17,393.0
Maximum            
Roll-forward of the unrecognized tax benefits            
Extended limitation tax evasion period (in years)   10 years 10 years 10 years    
Minimum            
Roll-forward of the unrecognized tax benefits            
Extended limitation tax evasion period (in years)   5 years 5 years 5 years