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OPERATING SEGMENT INFORMATION - Segment Revenue (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
Revenue € 4,883 € 5,907 € 5,686
P&ARP      
Disclosure of operating segments [line items]      
Revenue 2,725 3,139 3,050
A&T      
Disclosure of operating segments [line items]      
Revenue 1,002 1,420 1,339
AS&I      
Disclosure of operating segments [line items]      
Revenue 1,156 1,348 1,287
H&C      
Disclosure of operating segments [line items]      
Revenue 0 0 10
Segment revenue      
Disclosure of operating segments [line items]      
Revenue 4,926 5,962 5,748
Segment revenue | P&ARP      
Disclosure of operating segments [line items]      
Revenue 2,734 3,149 3,059
Segment revenue | A&T      
Disclosure of operating segments [line items]      
Revenue 1,025 1,462 1,389
Segment revenue | AS&I      
Disclosure of operating segments [line items]      
Revenue 1,167 1,351 1,290
Segment revenue | H&C      
Disclosure of operating segments [line items]      
Revenue 0 0 10
Inter-segment elimination      
Disclosure of operating segments [line items]      
Revenue (43) (55) (62)
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 (23) (42) (50)
Inter-segment elimination | AS&I      
Disclosure of operating segments [line items]      
Revenue (11) (3) (3)
Inter-segment elimination | H&C      
Disclosure of operating segments [line items]      
Revenue € 0 € 0 € 0