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OPERATING SEGMENT INFORMATION - Segment Revenue (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]      
Revenue € 7,239 € 8,120 € 6,152
P&ARP      
Disclosure of operating segments [line items]      
Revenue 3,879 4,655 3,688
A&T      
Disclosure of operating segments [line items]      
Revenue 1,714 1,645 1,102
AS&I      
Disclosure of operating segments [line items]      
Revenue 1,627 1,820 1,362
H&C      
Disclosure of operating segments [line items]      
Revenue 19 0 0
Segment revenue      
Disclosure of operating segments [line items]      
Revenue 7,275 8,225 6,223
Segment revenue | P&ARP      
Disclosure of operating segments [line items]      
Revenue 3,898 4,664 3,698
Segment revenue | A&T      
Disclosure of operating segments [line items]      
Revenue 1,728 1,700 1,142
Segment revenue | AS&I      
Disclosure of operating segments [line items]      
Revenue 1,630 1,861 1,383
Segment revenue | H&C      
Disclosure of operating segments [line items]      
Revenue 19 0 0
Inter-segment elimination      
Disclosure of operating segments [line items]      
Revenue (36) (105) (71)
Inter-segment elimination | P&ARP      
Disclosure of operating segments [line items]      
Revenue (19) (9) (10)
Inter-segment elimination | A&T      
Disclosure of operating segments [line items]      
Revenue (14) (55) (40)
Inter-segment elimination | AS&I      
Disclosure of operating segments [line items]      
Revenue (3) (41) (21)
Inter-segment elimination | H&C      
Disclosure of operating segments [line items]      
Revenue € 0 € 0 € 0