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SHARE-BASED COMPENSATION - Narrative (Details)
€ / shares in Units, € in Millions
1 Months Ended 12 Months Ended
May 31, 2021
shares
Jul. 31, 2020
shares
Dec. 31, 2021
EUR (€)
shares
€ / shares
Dec. 31, 2020
EUR (€)
shares
€ / shares
Dec. 31, 2019
EUR (€)
shares
Share Based Payment Plans [line items]          
Expense from share-based payment transactions with employees | €     € 15 € 15 € 16
Antidilutive securities (in shares)       6,402,289  
PSUs          
Share Based Payment Plans [line items]          
Share based compensation, vesting period     3 years    
Total shareholder return (TSR) percentage achieved 182.90% 186.80%      
Potential additional shares granted (in shares) 1,161,718 1,458,985      
Share price at grant date (in EUR per share) | € / shares     € 13.90 € 4.64  
PSUs | Bottom of range          
Share Based Payment Plans [line items]          
Percentage of vesting multiplier     0.00%    
PSUs | Top of range          
Share Based Payment Plans [line items]          
Percentage of vesting multiplier     200.00%    
RSUs          
Share Based Payment Plans [line items]          
Potential additional shares granted (in shares)     534,499 910,047  
RSUs | Certain Employees And Chief Financial Officer          
Share Based Payment Plans [line items]          
Vesting period on the grant date     3 years    
Share price at grant date (in EUR per share) | € / shares     € 13.90    
RSUs | Board Members          
Share Based Payment Plans [line items]          
Potential additional shares granted (in shares)     0 0 2