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FINANCIAL INSTRUMENTS - Other Financial Assets and Other Financial Liabilities Positions (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives assets € 8 € 12  
Current derivatives assets 31 58  
Derivative financial assets 39 70  
Non-current derivatives liabilities 14 6  
Current derivative liabilities 41 25  
Derivatives liabilities 55 31  
Other financing activities (3) (26) € (8)
Aluminium and premium derivatives      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives liabilities 0 0  
Current derivative liabilities 19 14  
Derivatives liabilities 19 14  
Energy derivatives      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives liabilities 3 0  
Current derivative liabilities 7 0  
Derivatives liabilities 10 0  
Other commodity derivatives      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives liabilities 0 0  
Current derivative liabilities 1 0  
Derivatives liabilities 1 0  
Currency commercial derivatives      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives liabilities 11 6  
Current derivative liabilities 14 11  
Derivatives liabilities 25 17  
Currency net debt derivatives | Forward purchase contracts versus EURO      
Disclosure of detailed information about financial instruments [line items]      
Nominal amount   565  
Other financing activities   (32)  
Aluminium and premium derivatives      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives assets 2 9  
Current derivatives assets 7 38  
Derivative financial assets 9 47  
Energy derivatives      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives assets 3 1  
Current derivatives assets 2 1  
Derivative financial assets 5 2  
Other commodity derivatives      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives assets 0 0  
Current derivatives assets 2 4  
Derivative financial assets 2 4  
Currency commercial derivatives      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives assets 3 2  
Current derivatives assets 20 14  
Derivative financial assets 23 16  
Currency net debt derivatives      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives assets 0 0  
Current derivatives assets 0 1  
Derivative financial assets € 0 € 1