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OPERATING SEGMENT INFORMATION - Segment Revenue (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]      
Revenue € 6,152 € 4,883 € 5,907
P&ARP      
Disclosure of operating segments [line items]      
Revenue 3,688 2,725 3,139
A&T      
Disclosure of operating segments [line items]      
Revenue 1,102 1,002 1,420
AS&I      
Disclosure of operating segments [line items]      
Revenue 1,362 1,156 1,348
Segment revenue      
Disclosure of operating segments [line items]      
Revenue 6,223 4,926 5,962
Segment revenue | P&ARP      
Disclosure of operating segments [line items]      
Revenue 3,698 2,734 3,149
Segment revenue | A&T      
Disclosure of operating segments [line items]      
Revenue 1,142 1,025 1,462
Segment revenue | AS&I      
Disclosure of operating segments [line items]      
Revenue 1,383 1,167 1,351
Inter-segment elimination      
Disclosure of operating segments [line items]      
Revenue (71) (43) (55)
Inter-segment elimination | P&ARP      
Disclosure of operating segments [line items]      
Revenue (10) (9) (10)
Inter-segment elimination | A&T      
Disclosure of operating segments [line items]      
Revenue (40) (23) (42)
Inter-segment elimination | AS&I      
Disclosure of operating segments [line items]      
Revenue € (21) € (11) € (3)