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OPERATING SEGMENT INFORMATION - Narrative (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2023
EUR (€)
employee
country
facility
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Disclosure of operating segments [line items]      
Number of employees | employee 12,000    
Revenue € 7,239 € 8,120 € 6,152
P&ARP      
Disclosure of operating segments [line items]      
Number of facilities | facility 4    
Number of countries in which entity operates | country 3    
Number of employees | employee 4,200    
Revenue € 3,879 4,655 3,688
P&ARP | Group's largest customer      
Disclosure of operating segments [line items]      
Revenue € 734 839 692
A&T      
Disclosure of operating segments [line items]      
Number of facilities | facility 5    
Number of countries in which entity operates | country 3    
Number of employees | employee 3,400    
Revenue € 1,714 1,645 1,102
AS&I      
Disclosure of operating segments [line items]      
Number of facilities | facility 16    
Number of countries in which entity operates | country 10    
Number of employees | employee 4,100    
Revenue € 1,627 € 1,820 € 1,362