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INCOME TAXES - Valuation allowance (Details)
€ in Millions, ¥ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
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   65.0     60.0 50.0
Addition for tax positions   2.0     5.0 10.0
Balance at the end of the year   ¥ 67.0     65.0 60.0
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    
Percentage of dividend distribution on current year net income   45.00% 45.00% 45.00%    
PRC dividend withholding tax accrued   ¥ 75.0     100.0  
Additional provision for PRC 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 liability reduction due to unrecognized tax benefits   ¥ 0.2        
Cash dividends declared | $ $ 68          
Period Of Statute Of Limitations For Assessment and Collection of Taxes   4 years 4 years 4 years    
Revenues   ¥ 21,882.0 $ 3,082 € 750 13,862.0 12,785.0
Tax paid by large multination enterprises   15.00% 15.00% 15.00%    
GERMANY            
Valuation allowance            
Tax loss carryforwards   ¥ 1,725.0        
Roll-forward of the unrecognized tax benefits            
Revenues   3,324.0     2,458.0 1,263.0
China            
Valuation allowance            
Tax loss carryforwards, expire between 2024 and 2028   3,098.0        
Roll-forward of the unrecognized tax benefits            
Revenues   ¥ 17,393.0     ¥ 10,637.0 ¥ 11,231.0
Maximum [Member]            
Roll-forward of the unrecognized tax benefits            
Extended limitation tax evasion period (in years)   10 years 10 years 10 years    
Minimum [Member]            
Roll-forward of the unrecognized tax benefits            
Extended limitation tax evasion period (in years)   5 years 5 years 5 years