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DEBT - Bank borrowings (Details)
€ in Millions, ¥ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2021
CNY (¥)
Dec. 31, 2019
EUR (€)
Mar. 31, 2019
CNY (¥)
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Apr. 17, 2020
EUR (€)
Apr. 17, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt                              
Repayment of line of credit facility | $                   $ 0          
Revolving credit loan and the available credit facility terminated | $         $ 500,000,000                    
Long-term debt | ¥             ¥ 10,856       ¥ 3,565        
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)       2.73% 2.73% 2.89% 2.89% 2.89%              
Term Facility Expiring December 2022                              
Debt                              
Maximum borrowing amount | €   € 440             € 440       € 440    
Credit facility drawn down amount | €           € 1     € 440            
Repayment of line of credit facility | €       € 101                      
Long-term debt       € 338             2,440        
Revolving Credit Facility Expiring December 2022                              
Debt                              
Term of debt instrument   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                
Weighted average interest rate (as a percent)       4.75% 4.75% 4.75% 4.75% 4.75%              
Syndicated Loan Facility Expiring in December 2032                              
Debt                              
Term of debt instrument 12 years                            
Maximum borrowing amount | ¥ ¥ 650                            
Long-term debt | ¥                     ¥ 53        
Weighted average interest rate (as a percent)       4.41% 4.41%                    
Syndicated Loan Facility Expiring in December 2032 | Prime Rate                              
Debt                              
Percentage points added to the reference rate 0.24%