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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Basis of presentation- Debt (Details)
€ in Millions, ¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Mar. 31, 2022
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
EUR (€)
Nov. 03, 2017
USD ($)
Debt Instrument [Line Items]                
Working capital deficit ¥ 5,726         $ 898    
Outstanding balance of long-term debt 3,565   ¥ 10,856          
Unused facilities         ¥ 2,994      
Net Cash Provided by (Used in) Operating Activities 1,342 $ 210 609 ¥ 3,293        
Equity securities with readily determinable fair value 2,589   ¥ 3,903     406    
Term Facility Expiring December 2022                
Debt Instrument [Line Items]                
Outstanding balance of long-term debt 2,440           € 338  
Term Facility Expiring December 2022 | Credit Facility                
Debt Instrument [Line Items]                
Aggregate principal amount 3,177           € 440  
Convertible senior notes | 2022 Notes                
Debt Instrument [Line Items]                
Aggregate principal amount ¥ 3,027         $ 475   $ 475