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OPERATING SEGMENT INFORMATION - Segment Revenue (Details) - EUR (€)
€ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disclosure of operating segments [line items]        
Revenue € 1,795 € 1,950 € 3,526 € 3,906
P&ARP        
Disclosure of operating segments [line items]        
Revenue 999 1,045 1,933 2,070
A&T        
Disclosure of operating segments [line items]        
Revenue 439 462 870 909
AS&I        
Disclosure of operating segments [line items]        
Revenue 356 443 720 926
H&C        
Disclosure of operating segments [line items]        
Revenue 2 0 3 1
Segment revenue        
Disclosure of operating segments [line items]        
Revenue 1,812 1,956 3,556 3,922
Segment revenue | P&ARP        
Disclosure of operating segments [line items]        
Revenue 1,001 1,049 1,939 2,079
Segment revenue | A&T        
Disclosure of operating segments [line items]        
Revenue 452 464 893 916
Segment revenue | AS&I        
Disclosure of operating segments [line items]        
Revenue 357 443 721 926
Segment revenue | H&C        
Disclosure of operating segments [line items]        
Revenue 2 0 3 1
Inter-segment elimination        
Disclosure of operating segments [line items]        
Revenue (17) (6) (30) (16)
Inter-segment elimination | P&ARP        
Disclosure of operating segments [line items]        
Revenue (2) (4) (6) (9)
Inter-segment elimination | A&T        
Disclosure of operating segments [line items]        
Revenue (13) (2) (23) (7)
Inter-segment elimination | AS&I        
Disclosure of operating segments [line items]        
Revenue (1) 0 (1) 0
Inter-segment elimination | H&C        
Disclosure of operating segments [line items]        
Revenue € 0 € 0 € 0 € 0