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FINANCIAL INSTRUMENTS - Other Financial Assets and Other Financial Liabilities Positions (Details) - EUR (€) € in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives assets | € 2 | € 8
Current derivatives assets | 30 | 31
Derivative financial assets | 32 | 39
Non-current derivatives liabilities | 8 | 14
Current derivative liabilities | 34 | 41
Derivatives liabilities | 42 | 55
Aluminium and premium derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives liabilities | 1 | 0
Current derivative liabilities | 9 | 19
Derivatives liabilities | 10 | 19
Energy derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives liabilities | 3 | 3
Current derivative liabilities | 9 | 7
Derivatives liabilities | 12 | 10
Other commodity derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives liabilities | 0 | 0
Current derivative liabilities | 2 | 1
Derivatives liabilities | 2 | 1
Currency commercial derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives liabilities | 4 | 11
Current derivative liabilities | 14 | 14
Derivatives liabilities | 18 | 25
Aluminium and premium derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives assets | 1 | 2
Current derivatives assets | 17 | 7
Derivative financial assets | 18 | 9
Energy derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives assets | 0 | 3
Current derivatives assets | 0 | 2
Derivative financial assets | 0 | 5
Other commodity derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives assets | 0 | 0
Current derivatives assets | 1 | 2
Derivative financial assets | 1 | 2
Currency commercial derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives assets | 1 | 3
Current derivatives assets | 10 | 20
Derivative financial assets | 11 | 23
Currency net debt derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-current derivatives assets | 0 | 0
Current derivatives assets | 2 | 0
Derivative financial assets | € 2 | € 0

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