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FINANCIAL INSTRUMENTS - Other Financial Assets and Other Financial Liabilities Positions (Details) - EUR (€) | Jun. 30, 2024 | Dec. 31, 2023
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Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives assets | € 2,000,000 | € 2,000,000
Current derivatives assets | 22,000,000 | 30,000,000
Derivative financial assets | 24,000,000 | 32,000,000
Non-current derivatives liabilities | 11,000,000 | 8,000,000
Current derivative liabilities | 30,000,000 | 34,000,000
Derivatives liabilities | 41,000,000 | 42,000,000
Aluminium and premium derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives liabilities | 1,000,000 | 1,000,000
Current derivative liabilities | 6,000,000 | 9,000,000
Derivatives liabilities | 7,000,000 | 10,000,000
Energy derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives liabilities | 1,000,000 | 3,000,000
Current derivative liabilities | 6,000,000 | 9,000,000
Derivatives liabilities | 7,000,000 | 12,000,000
Other commodity derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives liabilities | 0 | 0
Current derivative liabilities | 1,000,000 | 2,000,000
Derivatives liabilities | 1,000,000 | 2,000,000
Currency commercial derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives liabilities | 9,000,000 | 4,000,000
Current derivative liabilities | 17,000,000 | 14,000,000
Derivatives liabilities | 26,000,000 | 18,000,000
Aluminium and premium derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives assets | 2,000,000 | 1,000,000
Current derivatives assets | 15,000,000 | 17,000,000
Derivative financial assets | 17,000,000 | 18,000,000
Other commodity derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives assets | 0 | 0
Current derivatives assets | 4,000,000 | 1,000,000
Derivative financial assets | 4,000,000 | 1,000,000
Currency commercial derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives assets | 0 | 1,000,000
Current derivatives assets | 3,000,000 | 10,000,000
Derivative financial assets | 3,000,000 | 11,000,000
Currency net debt derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives assets | 0 | 0
Current derivatives assets | 0 | 2,000,000
Derivative financial assets | 0 | 2,000,000
Margin call |  |
Disclosure of detailed information about financial instruments [line items] |  |
Current derivatives assets | € 0 | € 0

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