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OPERATING SEGMENT INFORMATION - Segment Revenue (Details) - EUR (€)
€ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disclosure of operating segments [line items]        
Revenue € 1,950 € 2,275 € 3,906 € 4,254
P&ARP        
Disclosure of operating segments [line items]        
Revenue 1,045 1,347 2,070 2,512
A&T        
Disclosure of operating segments [line items]        
Revenue 462 440 909 813
AS&I        
Disclosure of operating segments [line items]        
Revenue 443 488 926 929
H&C        
Disclosure of operating segments [line items]        
Revenue 0 0 1 0
Segment revenue        
Disclosure of operating segments [line items]        
Revenue 1,956 2,310 3,922 4,322
Segment revenue | P&ARP        
Disclosure of operating segments [line items]        
Revenue 1,049 1,348 2,079 2,516
Segment revenue | A&T        
Disclosure of operating segments [line items]        
Revenue 464 461 916 846
Segment revenue | AS&I        
Disclosure of operating segments [line items]        
Revenue 443 501 926 960
Segment revenue | H&C        
Disclosure of operating segments [line items]        
Revenue 0 0 1 0
Inter-segment elimination        
Disclosure of operating segments [line items]        
Revenue (6) (35) (16) (68)
Inter-segment elimination | P&ARP        
Disclosure of operating segments [line items]        
Revenue (4) (1) (9) (4)
Inter-segment elimination | A&T        
Disclosure of operating segments [line items]        
Revenue (2) (21) (7) (33)
Inter-segment elimination | AS&I        
Disclosure of operating segments [line items]        
Revenue 0 (13) 0 (31)
Inter-segment elimination | H&C        
Disclosure of operating segments [line items]        
Revenue € 0 € 0 € 0 € 0