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TRADE RECEIVABLES AND OTHER - Narrative (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Disclosure of trade and other receivables [line items]      
Total factored assets   € 639,000,000 € 514,000,000
Factored assets derecognized   345,000,000 398,000,000
Debt due factor   0 € 0
United States | Factoring of receivables | Muscle Shoals factoring facility      
Disclosure of trade and other receivables [line items]      
Factoring maximum capacity | $ $ 300,000,000    
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   255,000,000  
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   € 150,000,000