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OPERATING SEGMENT INFORMATION - Segment Capital Expenditures (Details) - EUR (€)
€ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure of operating segments [line items]    
Capital expenditures € (74) € (100)
P&ARP    
Disclosure of operating segments [line items]    
Capital expenditures (27) (38)
A&T    
Disclosure of operating segments [line items]    
Capital expenditures (21) (25)
AS&I    
Disclosure of operating segments [line items]    
Capital expenditures (24) (35)
H&C    
Disclosure of operating segments [line items]    
Capital expenditures € (2) € (2)