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OPERATING SEGMENT INFORMATION - Segment Revenue (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [line items]      
Revenue € 8,120 € 6,152 € 4,883
P&ARP      
Disclosure of operating segments [line items]      
Revenue 4,655 3,688 2,725
A&T      
Disclosure of operating segments [line items]      
Revenue 1,645 1,102 1,002
AS&I      
Disclosure of operating segments [line items]      
Revenue 1,820 1,362 1,156
Segment revenue      
Disclosure of operating segments [line items]      
Revenue 8,225 6,223 4,926
Segment revenue | P&ARP      
Disclosure of operating segments [line items]      
Revenue 4,664 3,698 2,734
Segment revenue | A&T      
Disclosure of operating segments [line items]      
Revenue 1,700 1,142 1,025
Segment revenue | AS&I      
Disclosure of operating segments [line items]      
Revenue 1,861 1,383 1,167
Inter-segment elimination      
Disclosure of operating segments [line items]      
Revenue (105) (71) (43)
Inter-segment elimination | P&ARP      
Disclosure of operating segments [line items]      
Revenue (9) (10) (9)
Inter-segment elimination | A&T      
Disclosure of operating segments [line items]      
Revenue (55) (40) (23)
Inter-segment elimination | AS&I      
Disclosure of operating segments [line items]      
Revenue € (41) € (21) € (11)