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FINANCIAL RISK MANAGEMENT - Narrative (Details) $ in Millions | Jun. 30, 2024 EUR (€) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2023 USD ($) | Jun. 30, 2023 EUR (€) | Dec. 31, 2022 EUR (€)
--- | --- | --- | --- | --- | --- | ---
Disclosure of liquidity risk [line items] |  |  |  |  |  |
Revolving credit facilities outstanding availability | € 552,000,000 |  |  |  |  |
Liquidity value | 869,000,000 |  |  |  |  |
Cash and cash equivalents | 213,000,000 |  | € 202,000,000 |  | € 178,000,000 | € 166,000,000
Undrawn facilities | 656,000,000 |  |  |  |  |
Margin requirement | 22,000,000 |  | 30,000,000 |  |  |
Margin call |  |  |  |  |  |
Disclosure of liquidity risk [line items] |  |  |  |  |  |
Margin requirement | 0 |  | € 0 |  |  |
Derivative classified as cash flow hedge |  |  |  |  |  |
Disclosure of liquidity risk [line items] |  |  |  |  |  |
Nominal amount hedging instrument | $ |  | $ 470 |  | $ 209 |  |
U.S. Revolving Facility |  |  |  |  |  |
Disclosure of liquidity risk [line items] |  |  |  |  |  |
Borrowing base | € 467,000,000 | 500 |  |  |  |
French Inventory Based Facility |  |  |  |  |  |
Disclosure of liquidity risk [line items] |  |  |  |  |  |
Borrowing base | $ |  | $ 100 |  |  |  |

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