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FINANCE COSTS—NET (Details) - EUR (€) € in Millions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 02, 2021 | Feb. 24, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Analysis of income and expense [line items] |  |  |  |  |  |  |
Interest expense on borrowings |  |  | € (26) | € (32) | € (56) | € (64) |
Interest expense on leases |  |  | (2) | (2) | (5) | (5) |
Interest cost on pension and other benefits |  |  | (2) | (3) | (4) | (6) |
Expenses on factoring arrangements |  |  | (2) | (3) | (4) | (6) |
Net loss on settlement of debt |  |  | (6) | 0 | (23) | 0 |
Realized and unrealized (losses) / gains on debt derivatives at fair value |  |  | (15) | (7) | 0 | 1 |
Realized and unrealized exchange (losses) / gains on financing activities - net |  |  | 16 | 8 | 0 | (3) |
Other finance expenses |  |  | (1) | (4) | (1) | (5) |
Capitalized borrowing costs |  |  | 1 | 1 | 1 | 1 |
Finance expenses |  |  | (37) | (42) | (92) | (87) |
Finance costs - net |  |  | € (37) | € (42) | (92) | (87) |
Redemption of senior notes |  |  |  |  | € 863 | € 200 | € 200
Capitalization rate |  |  |  |  | 5.00% | 6.00% |
Constellium SE Senior Notes |  |  |  |  |  |  |
Analysis of income and expense [line items] |  |  |  |  |  |  |
Interest expense on debt instruments issued |  |  |  |  | € 50 | € 57 |
Borrowing costs recognised as expense |  |  |  |  | € 2 | € 3 |
Senior Unsecured Notes due 2025 |  |  |  |  |  |  |
Analysis of income and expense [line items] |  |  |  |  |  |  |
Redemption of senior notes |  | € 650 |  |  |  |  |
Nominal rate |  | 6.625% |  |  | 6.625% |  |
Debt redemption fees |  | € 9 |  |  |  |  |
Write off of deferred debt costs |  | € 8 |  |  |  |  |
Senior Unsecured Notes due 2024 |  |  |  |  |  |  |
Analysis of income and expense [line items] |  |  |  |  |  |  |
Redemption of senior notes | € 400 |  |  |  |  |  |
Nominal rate | 5.75% |  |  |  | 5.75% |  |
Debt redemption fees | € 3 |  |  |  |  |  |
Write off of deferred debt costs | € 3 |  |  |  |  |  |

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