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FINANCIAL INSTRUMENTS - Other Financial Assets and Other Financial Liabilities Positions (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items] |  |  |
Non-current derivatives assets | € 12 | € 18 |
Current derivatives assets | 58 | 39 |
Derivative financial assets | 70 | 57 |
Non-current derivatives liabilities | 6 | 41 |
Current derivative liabilities | 25 | 46 |
Derivatives liabilities | 31 | 87 |
Other financing activities | (26) | (8) | € 5
Aluminium and premium derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Non-current derivatives liabilities | 0 | 3 |
Current derivative liabilities | 14 | 6 |
Derivatives liabilities | 14 | 9 |
Other commodity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Non-current derivatives liabilities | 0 | 0 |
Current derivative liabilities | 0 | 1 |
Derivatives liabilities | 0 | 1 |
Currency commercial derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Non-current derivatives liabilities | 6 | 4 |
Current derivative liabilities | 11 | 28 |
Derivatives liabilities | 17 | 32 |
Currency net debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Non-current derivatives liabilities | 0 | 34 |
Current derivative liabilities | 0 | 11 |
Derivatives liabilities | 0 | 45 |
Currency net debt derivatives | Forward purchase contracts versus EURO |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Nominal amount | 565 |  |
Other financing activities | (32) |  |
Aluminium and premium derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Non-current derivatives assets | 9 | 1 |
Current derivatives assets | 38 | 18 |
Derivative financial assets | 47 | 19 |
Energy derivatives |  |  |
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 |
Other commodity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Non-current derivatives assets | 0 | 1 |
Current derivatives assets | 4 | 1 |
Derivative financial assets | 4 | 2 |
Currency commercial derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Non-current derivatives assets | 2 | 16 |
Current derivatives assets | 14 | 17 |
Derivative financial assets | 16 | 33 |
Currency net debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Non-current derivatives assets | 0 | 0 |
Current derivatives assets | 1 | 0 |
Derivative financial assets | 1 | 0 |
Margin call |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Non-current derivatives assets | 0 | 0 |
Current derivatives assets | 0 | 3 |
Derivative financial assets | € 0 | € 3 |

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