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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

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