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FINANCIAL INSTRUMENTS - Other Financial Assets and Other Financial Liabilities Positions (Details) - EUR (€)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives assets € 16,000,000   € 18,000,000
Current derivatives assets 63,000,000   39,000,000
Derivative financial assets 79,000,000   57,000,000
Non-current derivatives liabilities 10,000,000   41,000,000
Current derivative liabilities 26,000,000   46,000,000
Derivatives liabilities 36,000,000   87,000,000
Payment for forward purchase currency bought-out before maturity (29,000,000) € 2,000,000  
Aluminium and premium future contracts      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives liabilities 1,000,000   3,000,000
Current derivative liabilities 7,000,000   6,000,000
Derivatives liabilities 8,000,000   9,000,000
Other future contracts      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives liabilities 0   0
Current derivative liabilities 1,000,000   1,000,000
Derivatives liabilities 1,000,000   1,000,000
Currency commercial contracts      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives liabilities 2,000,000   4,000,000
Current derivative liabilities 16,000,000   28,000,000
Derivatives liabilities 18,000,000   32,000,000
Currency net debt derivatives      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives liabilities 7,000,000   34,000,000
Current derivative liabilities 2,000,000   11,000,000
Derivatives liabilities 9,000,000   45,000,000
Currency net debt derivatives | Forward purchase contracts versus EURO      
Disclosure of detailed information about financial instruments [line items]      
Forward purchase currency bought-out before maturity 325,000,000    
Payment for forward purchase currency bought-out before maturity 27,000,000    
Aluminium and premium future contracts      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives assets 8,000,000   1,000,000
Current derivatives assets 42,000,000   18,000,000
Derivative financial assets 50,000,000   19,000,000
Energy future contracts      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives assets 0   0
Current derivatives assets 1,000,000   0
Derivative financial assets 1,000,000   0
Other future contracts      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives assets 1,000,000   1,000,000
Current derivatives assets 3,000,000   1,000,000
Derivative financial assets 4,000,000   2,000,000
Currency commercial contracts      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives assets 7,000,000   16,000,000
Current derivatives assets 17,000,000   17,000,000
Derivative financial assets 24,000,000   33,000,000
Margin call      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivatives assets 0   0
Current derivatives assets 0   3,000,000
Derivative financial assets € 0   € 3,000,000