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FINANCIAL INSTRUMENTS - Other Financial Assets and Other Financial Liabilities Positions (Details) - EUR (€) € in Millions | Dec. 31, 2020 | Dec. 31, 2019
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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

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