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DEBT - Bank borrowings (Details)
€ in Millions, ¥ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2019
USD ($)
Mar. 31, 2019
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Apr. 17, 2020
USD ($)
Apr. 17, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
EUR (€)
Debt                        
Repayment of line of credit facility             $ 0          
Long-term debt | ¥     ¥ 10,856     ¥ 8,084            
Term facility and revolving credit facility                        
Debt                        
Percentage points added to the reference rate           2.00% 2.00%          
Weighted average interest rate (as a percent)     2.89% 2.89% 2.89% 2.86% 2.86%          
One Year Term Facility                        
Debt                        
Term of debt instrument 1 year                      
Maximum borrowing amount $ 180,000,000                      
Fixed interest rate (as a percent) 2.52%                      
Deposit paid             $ 185,000,000          
Credit facility drawn down amount $ 180,000,000                      
Repayment of line of credit facility             $ 0          
Term Facility Expiring December 2022                        
Debt                        
Maximum borrowing amount | €                   € 440   € 440
Credit facility drawn down amount         € 1 ¥ 440            
Revolving Credit Facility Expiring December 2022                        
Debt                        
Term of debt instrument           35 months 35 months          
Maximum borrowing amount                 $ 500,000,000   $ 500,000,000  
Credit facility drawn down amount     ¥ 200 $ 700,000,000     $ 500,000,000          
Repayment of line of credit facility       $ 500,000,000                
Available credit facility               $ 500,000,000        
Five Year Term Facility                        
Debt                        
Term of debt instrument   5 years                    
Maximum borrowing amount | ¥   ¥ 1,190 1,190                  
Repayment of line of credit facility | ¥     179     ¥ 89            
Long-term debt | ¥     ¥ 922                  
Weighted average interest rate (as a percent)     4.75% 4.75% 4.75% 4.75% 4.75%