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FINANCE COSTS—NET (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2021 EUR (€) | Nov. 30, 2021 USD ($) | Jun. 30, 2021 EUR (€) | Jun. 30, 2021 USD ($) | Feb. 28, 2021 EUR (€) | Feb. 28, 2021 USD ($) | Dec. 31, 2021 EUR (€) | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 EUR (€) | Dec. 31, 2021 USD ($)
Analysis of income and expense [line items] |  |  |  |  |  |  |  |  |  |
Interest expense on borrowings |  |  |  |  |  |  | € (103,000,000) | € (122,000,000) | € (129,000,000) |
Interest expense on leases |  |  |  |  |  |  | (14,000,000) | (10,000,000) | (13,000,000) |
Interest cost on pension and other benefits |  |  |  |  |  |  | (9,000,000) | (11,000,000) | (16,000,000) |
Expenses on factoring arrangements |  |  |  |  |  |  | (9,000,000) | (10,000,000) | (19,000,000) |
Net loss on settlement of debt |  |  |  |  |  |  | (27,000,000) | 0 | 0 |
Realized and unrealized (losses) / gains on debt derivatives at fair value |  |  |  |  |  |  | 10,000,000 | (32,000,000) | 13,000,000 |
Realized and unrealized exchange (losses) / gains on financing activities - net |  |  |  |  |  |  | (10,000,000) | 37,000,000 | (3,000,000) |
Other finance expenses |  |  |  |  |  |  | (6,000,000) | (12,000,000) | (11,000,000) |
Capitalized borrowing costs |  |  |  |  |  |  | 1,000,000 | 1,000,000 | 3,000,000 |
Finance expenses |  |  |  |  |  |  | (167,000,000) | (159,000,000) | (175,000,000) |
Finance costs - net |  |  |  |  |  |  | (167,000,000) | (159,000,000) | (175,000,000) |
Redemption of senior notes |  |  |  |  |  |  | 1,041,000,000 | € 200,000,000 | € 100,000,000 |
Nominal value |  |  |  |  |  |  | € 2,128,000,000 |  |  |
Capitalization rate |  |  |  |  |  |  | 5.00% | 6.00% | 6.00% |
Constellium SE Senior Notes |  |  |  |  |  |  |  |  |  |
Analysis of income and expense [line items] |  |  |  |  |  |  |  |  |  |
Interest expense on debt instruments issued |  |  |  |  |  |  | € 92,000,000 | € 111,000,000 |  |
Borrowing costs recognised as expense |  |  |  |  |  |  | € 4,000,000 | € 5,000,000 |  |
Senior Unsecured Notes Issued February 2017 and due 2025 |  |  |  |  |  |  |  |  |  |
Analysis of income and expense [line items] |  |  |  |  |  |  |  |  |  |
Redemption of senior notes |  |  |  |  | € 536,000,000 | $ 650,000,000 |  |  |  |
Nominal rate |  |  |  |  | 6.625% | 6.625% | 6.625% |  |  |
Borrowing redemption fees |  |  |  |  | € 9,000,000 |  |  |  |  |
Write off borrowing costs |  |  |  |  | € 8,000,000 |  |  |  |  |
Nominal value | $ |  |  |  |  |  |  |  |  |  | $ 650,000,000
Senior Unsecured Notes Issued May 2014 and due 2024 |  |  |  |  |  |  |  |  |  |
Analysis of income and expense [line items] |  |  |  |  |  |  |  |  |  |
Redemption of senior notes |  |  | € 328,000,000 | $ 400,000,000 |  |  |  |  |  |
Nominal rate |  |  | 5.75% | 5.75% |  |  | 5.75% |  |  |
Borrowing redemption fees |  |  | € 3,000,000 |  |  |  |  |  |  |
Write off borrowing costs |  |  | € 3,000,000 |  |  |  |  |  |  |
Nominal value | $ |  |  |  |  |  |  |  |  |  | 400,000,000
Senior Unsecured Notes Issued November 2017 and due 2026 |  |  |  |  |  |  |  |  |  |
Analysis of income and expense [line items] |  |  |  |  |  |  |  |  |  |
Redemption of senior notes | € 177,000,000 | $ 200,000,000 |  |  |  |  |  |  |  |
Nominal rate | 5.875% | 5.875% |  |  |  |  | 5.875% |  |  |
Borrowing redemption fees | € 3,000,000 |  |  |  |  |  |  |  |  |
Write off borrowing costs | € 1,000,000 |  |  |  |  |  |  |  |  |
Nominal value |  | $ 500,000,000 |  |  |  |  | € 265,000,000 |  |  | $ 300,000,000

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