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FINANCIAL INSTRUMENTS - Other Financial Assets and Other Financial Liabilities Positions (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives assets € 2 € 8
Current derivatives assets 30 31
Derivative financial assets 32 39
Non-current derivatives liabilities 8 14
Current derivative liabilities 34 41
Derivatives liabilities 42 55
Aluminium and premium derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives liabilities 1 0
Current derivative liabilities 9 19
Derivatives liabilities 10 19
Energy derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives liabilities 3 3
Current derivative liabilities 9 7
Derivatives liabilities 12 10
Other commodity derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives liabilities 0 0
Current derivative liabilities 2 1
Derivatives liabilities 2 1
Currency commercial derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives liabilities 4 11
Current derivative liabilities 14 14
Derivatives liabilities 18 25
Aluminium and premium derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives assets 1 2
Current derivatives assets 17 7
Derivative financial assets 18 9
Energy derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives assets 0 3
Current derivatives assets 0 2
Derivative financial assets 0 5
Other commodity derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives assets 0 0
Current derivatives assets 1 2
Derivative financial assets 1 2
Currency commercial derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives assets 1 3
Current derivatives assets 10 20
Derivative financial assets 11 23
Currency net debt derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives assets 0 0
Current derivatives assets 2 0
Derivative financial assets € 2 € 0