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OPERATING SEGMENT INFORMATION - Segment Revenue (Details) - EUR (€)
€ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disclosure of operating segments [line items]        
Revenue € 1,031 € 1,538 € 2,468 € 3,074
P&ARP        
Disclosure of operating segments [line items]        
Revenue 564 819 1,313 1,645
A&T        
Disclosure of operating segments [line items]        
Revenue 247 372 596 739
AS&I        
Disclosure of operating segments [line items]        
Revenue 220 347 559 690
Holdings & Corporate        
Disclosure of operating segments [line items]        
Revenue 0 0 0 0
Segment revenue        
Disclosure of operating segments [line items]        
Revenue 1,037 1,551 2,490 3,101
Segment revenue | P&ARP        
Disclosure of operating segments [line items]        
Revenue 565 821 1,317 1,649
Segment revenue | A&T        
Disclosure of operating segments [line items]        
Revenue 250 383 609 761
Segment revenue | AS&I        
Disclosure of operating segments [line items]        
Revenue 222 347 564 691
Segment revenue | Holdings & Corporate        
Disclosure of operating segments [line items]        
Revenue 0 0 0 0
Inter-segment elimination        
Disclosure of operating segments [line items]        
Revenue (6) (13) (22) (27)
Inter-segment elimination | P&ARP        
Disclosure of operating segments [line items]        
Revenue (1) (2) (4) (4)
Inter-segment elimination | A&T        
Disclosure of operating segments [line items]        
Revenue (3) (11) (13) (22)
Inter-segment elimination | AS&I        
Disclosure of operating segments [line items]        
Revenue (2) 0 (5) (1)
Inter-segment elimination | Holdings & Corporate        
Disclosure of operating segments [line items]        
Revenue € 0 € 0 € 0 € 0