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FINANCIAL INSTRUMENTS - Other Financial Assets and Other Financial Liabilities Positions (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives assets € 12 € 18  
Current derivatives assets 58 39  
Derivative financial assets 70 57  
Non-current derivatives liabilities 6 41  
Current derivative liabilities 25 46  
Derivatives liabilities 31 87  
Other financing activities (26) (8) € 5
Aluminium and premium derivatives      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives liabilities 0 3  
Current derivative liabilities 14 6  
Derivatives liabilities 14 9  
Other commodity derivatives      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives liabilities 0 0  
Current derivative liabilities 0 1  
Derivatives liabilities 0 1  
Currency commercial derivatives      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives liabilities 6 4  
Current derivative liabilities 11 28  
Derivatives liabilities 17 32  
Currency net debt derivatives      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives liabilities 0 34  
Current derivative liabilities 0 11  
Derivatives liabilities 0 45  
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 9 1  
Current derivatives assets 38 18  
Derivative financial assets 47 19  
Energy derivatives      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives assets 1 0  
Current derivatives assets 1 0  
Derivative financial assets 2 0  
Other commodity derivatives      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives assets 0 1  
Current derivatives assets 4 1  
Derivative financial assets 4 2  
Currency commercial derivatives      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives assets 2 16  
Current derivatives assets 14 17  
Derivative financial assets 16 33  
Currency net debt derivatives      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives assets 0 0  
Current derivatives assets 1 0  
Derivative financial assets 1 0  
Margin call      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives assets 0 0  
Current derivatives assets 0 3  
Derivative financial assets € 0 € 3