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TRADE RECEIVABLES AND OTHER - Narrative (Details)
 12 Months Ended
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
EUR (€)
Disclosure of trade and other receivables [line items]      
Contract assets € 16,000,000   € 15,000,000
Total factored assets 494,000,000   574,000,000
Factored assets derecognized 356,000,000   368,000,000
Debt due factor 1,000,000   6,000,000
Unbilled Tooling Costs      
Disclosure of trade and other receivables [line items]      
Contract assets 7,000,000   € 4,000,000
United States | Factoring of receivables | Muscle Shoals factoring facility      
Disclosure of trade and other receivables [line items]      
Factoring maximum capacity | $   $ 175,000,000  
United States | Factoring of receivables | Constellium automotive      
Disclosure of trade and other receivables [line items]      
Factoring maximum capacity | $   $ 25,000,000  
France | Factoring of receivables      
Disclosure of trade and other receivables [line items]      
Factoring maximum capacity 250,000,000    
France | Factoring Receivable, Recourse Line      
Disclosure of trade and other receivables [line items]      
Factoring maximum capacity 20,000,000    
Germany, Switzerland and Czech Republic | Factoring of receivables      
Disclosure of trade and other receivables [line items]      
Factoring maximum capacity € 200,000,000