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FINANCIAL RISK MANAGEMENT - Narrative (Details) € in Millions, $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2023 EUR (€) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 EUR (€) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 EUR (€) | Dec. 31, 2020 EUR (€)
Disclosure of liquidity risk [line items] |  |  |  |  |  |  |
Percentage of trade account receivables insured | 80.00% |  |  | 80.00% |  |  |
Revolving credit facilities outstanding availability | € 524 |  |  |  |  |  |
Liquidity value | 737 |  | € 709 |  |  |  |
Cash and cash equivalents | 202 |  | 166 |  |  | € 147 | € 439
Undrawn facilities | 535 |  | 543 |  |  |  |
Derivative classified as cash flow hedge |  |  |  |  |  |  |
Disclosure of liquidity risk [line items] |  |  |  |  |  |  |
Nominal amount hedging instrument | $ |  |  |  | $ 209 | $ 248 |  |
Forward purchase contracts versus EURO | Foreign exchange forward contracts |  |  |  |  |  |  |
Disclosure of liquidity risk [line items] |  |  |  |  |  |  |
Net position hedges related to loans and deposits | $ |  | $ 82 |  |  |  |  |
U.S. Revolving Facility |  |  |  |  |  |  |
Disclosure of liquidity risk [line items] |  |  |  |  |  |  |
Borrowing base | $ |  |  |  | $ 439 |  |  |
French Inventory Based Facility |  |  |  |  |  |  |
Disclosure of liquidity risk [line items] |  |  |  |  |  |  |
Borrowing base | 100 |  |  |  |  |  |
Currency risk |  |  |  |  |  |  |
Disclosure of liquidity risk [line items] |  |  |  |  |  |  |
Margin requirement paid as collateral to counterparties |  |  | 0 |  |  |  |
10% increase or decrease in the market price | Aluminium |  |  |  |  |  |  |
Disclosure of liquidity risk [line items] |  |  |  |  |  |  |
Impact of increase or decrease in market price in gain or loss from derivatives | 38 |  |  |  |  |  |
Top of range | 50 basis point increase or decrease in the LIBOR or EURIBOR interest rates |  |  |  |  |  |  |
Disclosure of liquidity risk [line items] |  |  |  |  |  |  |
Impact of increase or decrease in interest rate in income before income tax | € 3 |  | € 3 |  |  |  |

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