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OPERATING SEGMENT INFORMATION - Segment Assets (Details) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]        
Total Assets € 4,129 € 4,184    
Deferred tax assets 193 185    
Cash and cash equivalents 439 184 € 164 € 269
Segment revenue        
Disclosure of operating segments [line items]        
Total Assets 3,440 3,786    
Segment revenue | P&ARP        
Disclosure of operating segments [line items]        
Total Assets 1,733 1,951    
Segment revenue | A&T        
Disclosure of operating segments [line items]        
Total Assets 765 856    
Segment revenue | AS&I        
Disclosure of operating segments [line items]        
Total Assets 668 703    
Segment revenue | H&C        
Disclosure of operating segments [line items]        
Total Assets 274 276    
Unallocated        
Disclosure of operating segments [line items]        
Deferred tax assets 193 185    
Cash and cash equivalents 439 184    
Other financial assets € 57 € 29