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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Basis of presentation- Debt (Details)
€ in Millions, ¥ in Millions, $ in Millions
9 Months Ended
Sep. 30, 2022
CNY (¥)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
CNY (¥)
Sep. 30, 2022
USD ($)
Sep. 30, 2022
EUR (€)
Dec. 31, 2021
CNY (¥)
SUMMARY OF PRINCIPAL ACCOUNTING POLICIES            
Working capital deficit ¥ 4,172     $ 586    
Unused facilities | ¥ 2,900          
Net Cash Provided by (Used in) Operating Activities 520 $ 72 ¥ 473      
Equity securities with readily determinable fair value ¥ 1,915     $ 269   ¥ 2,589
Revolving credit facility [Member]            
SUMMARY OF PRINCIPAL ACCOUNTING POLICIES            
Unused facilities | €         € 70