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FINANCIAL INSTRUMENTS - Other Financial Assets and Other Financial Liabilities Positions (Details) - EUR (€)
Jun. 30, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives assets € 2,000,000 € 2,000,000
Current derivatives assets 22,000,000 30,000,000
Derivative financial assets 24,000,000 32,000,000
Non-current derivatives liabilities 11,000,000 8,000,000
Current derivative liabilities 30,000,000 34,000,000
Derivatives liabilities 41,000,000 42,000,000
Aluminium and premium derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives liabilities 1,000,000 1,000,000
Current derivative liabilities 6,000,000 9,000,000
Derivatives liabilities 7,000,000 10,000,000
Energy derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives liabilities 1,000,000 3,000,000
Current derivative liabilities 6,000,000 9,000,000
Derivatives liabilities 7,000,000 12,000,000
Other commodity derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives liabilities 0 0
Current derivative liabilities 1,000,000 2,000,000
Derivatives liabilities 1,000,000 2,000,000
Currency commercial derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives liabilities 9,000,000 4,000,000
Current derivative liabilities 17,000,000 14,000,000
Derivatives liabilities 26,000,000 18,000,000
Aluminium and premium derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives assets 2,000,000 1,000,000
Current derivatives assets 15,000,000 17,000,000
Derivative financial assets 17,000,000 18,000,000
Other commodity derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives assets 0 0
Current derivatives assets 4,000,000 1,000,000
Derivative financial assets 4,000,000 1,000,000
Currency commercial derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives assets 0 1,000,000
Current derivatives assets 3,000,000 10,000,000
Derivative financial assets 3,000,000 11,000,000
Currency net debt derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives assets 0 0
Current derivatives assets 0 2,000,000
Derivative financial assets 0 2,000,000
Margin call    
Disclosure of detailed information about financial instruments [line items]    
Current derivatives assets € 0 € 0