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INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill € 462,000,000 € 478,000,000 € 451,000,000
P&ARP      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill 455,000,000    
Carrying value 1,500,000,000    
Recoverable value 2,000,000,000    
Goodwill impairment € 0    
Cash flow rates 40.00%    
P&ARP | Bottom of range      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Discount rate to estimate normative cash flows 9.50%    
P&ARP | Top of range      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Long term growth rate used to estimate normative cash flow 1.50%    
A&T      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill € 5,000,000    
AS&I      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill € 2,000,000