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FINANCIAL INSTRUMENTS - Other Financial Assets and Other Financial Liabilities Positions (Details) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives assets € 18 € 7
Current derivatives assets 39 22
Derivative financial assets 57 29
Non-current derivatives liabilities 41 23
Current derivative liabilities 46 35
Derivatives liabilities 87 58
Aluminium and premium future contracts    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives liabilities 3 4
Current derivative liabilities 6 10
Derivatives liabilities 9 14
Energy future contracts    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives liabilities 0 0
Current derivative liabilities 0 1
Derivatives liabilities 0 1
Other future contracts    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives liabilities 0 2
Current derivative liabilities 1 4
Derivatives liabilities 1 6
Currency commercial contracts    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives liabilities 4 12
Current derivative liabilities 28 16
Derivatives liabilities 32 28
Currency net debt derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives liabilities 34 5
Current derivative liabilities 11 4
Derivatives liabilities 45 9
Aluminium and premium future contracts    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives assets 1 1
Current derivatives assets 18 8
Derivative financial assets 19 9
Other future contracts    
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
Currency commercial contracts    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives assets 16 5
Current derivatives assets 17 12
Derivative financial assets 33 17
Currency net debt derivatives    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives assets 0 1
Current derivatives assets 0 2
Derivative financial assets 0 3
Margin call    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivatives assets 0 0
Current derivatives assets 3 0
Derivative financial assets € 3 € 0