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FINANCIAL INSTRUMENTS - Other Financial Assets and Other Financial Liabilities Positions (Details) - EUR (€) € in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives assets | € 9 | € 7
Current derivatives assets | 22 | 22
Derivatives assets | 31 | 29
Other non-current financial assets | 9 | 7
Other current financial assets | 22 | 22
Other financial assets | 31 | 29
Non-current derivatives liabilities | 30 | 23
Current derivative liabilities | 45 | 35
Derivatives liabilities | 75 | 58
Other non-current financial liabilities | 30 | 23
Other current financial liabilities | 45 | 35
Other financial liabilities | 75 | 58
Aluminium and premium future contracts |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives liabilities | 9 | 4
Current derivative liabilities | 19 | 10
Derivatives liabilities | 28 | 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 | 1 | 2
Current derivative liabilities | 4 | 4
Derivatives liabilities | 5 | 6
Currency commercial contracts |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives liabilities | 15 | 12
Current derivative liabilities | 21 | 16
Derivatives liabilities | 36 | 28
Currency net debt derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives liabilities | 5 | 5
Current derivative liabilities | 1 | 4
Derivatives liabilities | 6 | 9
Aluminium and premium future contracts |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives assets | 2 | 1
Current derivatives assets | 11 | 8
Derivatives assets | 13 | 9
Energy future contracts |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives assets | 0 | 0
Current derivatives assets | 0 | 0
Derivatives assets | 0 | 0
Other future contracts |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives assets | 0 | 0
Current derivatives assets | 0 | 0
Derivatives assets | 0 | 0
Currency commercial contracts |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives assets | 7 | 5
Current derivatives assets | 10 | 12
Derivatives assets | 17 | 17
Currency net debt derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives assets | 0 | 1
Current derivatives assets | 1 | 2
Derivatives assets | € 1 | € 3

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