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FINANCIAL INSTRUMENTS - Narrative (Details) - Fair value - Level 1 € in Millions | Dec. 31, 2023 EUR (€)
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Constellium SE Senior Notes Due 2024 |
Disclosure of detailed information about financial instruments [line items] |
Percentage of fair value senior notes issued | 100.00%
Senior notes issued | € 624
Senior Unsecured Notes Issued February 2017 and due 2025 |
Disclosure of detailed information about financial instruments [line items] |
Percentage of fair value senior notes issued | 99.00%
Senior notes issued | € 290
Constellium SE Senior Notes Due 2026 |
Disclosure of detailed information about financial instruments [line items] |
Percentage of fair value senior notes issued | 92.00%
Senior notes issued | € 414
Constellium SE Senir Notes Due 2028 |
Disclosure of detailed information about financial instruments [line items] |
Percentage of fair value senior notes issued | 92.00%
Senior notes issued | € 276

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