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FINANCE COSTS—NET (Details) - EUR (€) € in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Analysis of income and expense [line items] |  |  |  |  |
Interest expense on borrowings | € (21) | € (25) | € (44) | € (49) |
Interest expense on leases | (2) | (2) | (4) | (5) |
Interest cost on pension and other benefits | (5) | (4) | (8) | (8) |
Expenses on factoring arrangements | (5) | (5) | (9) | (10) |
Realized and unrealized (losses) / gains on debt derivatives at fair value | 0 | 4 | (1) | 4 |
Realized and unrealized exchange (losses) / gains on financing activities - net | 1 | (3) | 1 | (2) |
Other finance expenses | (1) | (1) | (2) | (2) |
Capitalized borrowing costs | 1 | 1 | 2 | 2 |
Finance expenses | (32) | (35) | (65) | (70) |
Finance costs - net | € (32) | € (35) | (65) | (70) |
Redemption of senior notes |  |  | € 4 | € 5 | € 53
Capitalization rate |  |  | 5.00% | 5.00% |
Constellium SE Senior Notes |  |  |  |  |
Analysis of income and expense [line items] |  |  |  |  |
Interest expense on borrowings |  |  |  | € (38) |
Borrowing costs recognised as expense |  |  | € 2 |  |

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