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Borrowings - Summary of Borrowings (Detail) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 EUR (€) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 EUR (€)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Nominal value | € 2,183,000,000 |  |  |  |
Arrangement fees | (34,000,000) |  |  |  |
Accrued interest | 35,000,000 |  |  |  |
Borrowings | 2,184,000,000 |  | € 2,127,000,000 |  | € 2,468,000,000
Non-current | 2,054,000,000 |  | 2,021,000,000 |  |
Current | € 130,000,000 |  | 106,000,000 |  |
Constellium N.V. senior unsecured notes (Issued May 2014, due 2024) [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Nominal rate | 5.75% |  |  |  |
Effective rate | 6.26% | 6.26% |  |  |
Nominal value | € 343,000,000 | $ 400,000,000 |  |  |
Arrangement fees | (4,000,000) |  |  |  |
Accrued interest | 2,000,000 |  |  |  |
Borrowings | € 341,000,000 |  | 332,000,000 |  |
Constellium N.V. senior unsecured notes (Issued May 2014, due 2021) [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Nominal rate | 4.63% |  |  |  |
Effective rate | 5.16% | 5.16% |  |  |
Nominal value | € 300,000,000 |  |  |  |
Arrangement fees | (3,000,000) |  |  |  |
Accrued interest | 2,000,000 |  |  |  |
Borrowings | € 299,000,000 |  | 298,000,000 |  |
Constellium N.V. Senior Unsecured Notes (Issued February 2017, due 2025) [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Nominal rate | 6.63% |  |  |  |
Effective rate | 7.13% | 7.13% |  |  |
Nominal value | € 558,000,000 | $ 650,000,000 |  |  |
Arrangement fees | (12,000,000) |  |  |  |
Accrued interest | 12,000,000 |  |  |  |
Borrowings | € 558,000,000 |  | 541,000,000 |  |
Constellium N.V. USD Senior Unsecured Notes (Issued November 2017, due 2026) [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Nominal rate | 5.88% |  |  |  |
Effective rate | 6.26% | 6.26% |  |  |
Nominal value | € 429,000,000 | $ 500,000,000 |  |  |
Arrangement fees | (8,000,000) |  |  |  |
Accrued interest | 10,000,000 |  |  |  |
Borrowings | € 431,000,000 |  | 413,000,000 |  |
Constellium N.V. EURO Senior Unsecured Notes (Issued November 2017, due 2026) [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Nominal rate | 4.25% |  |  |  |
Effective rate | 4.57% | 4.57% |  |  |
Nominal value | € 400,000,000 |  |  |  |
Arrangement fees | (7,000,000) |  |  |  |
Accrued interest | 6,000,000 |  |  |  |
Borrowings | 399,000,000 |  | 395,000,000 |  |
Other loans [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Nominal value | 76,000,000 |  |  |  |
Accrued interest | 3,000,000 |  |  |  |
Borrowings | € 79,000,000 |  | € 83,000,000 |  |
Pan US ABL facility (due 2022) [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Nominal rate | Floating |  |  |  |
Effective rate | 4.32% | 4.32% |  |  |
Nominal value | € 77,000,000 | $ 90,000,000 |  |  |
Borrowings | € 77,000,000 |  |  | $ 65,000,000 |
Secured inventory based facility (due 2019) [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Nominal rate | Floating |  |  |  |
Unsecured revolving credit facilities (due 2021) [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Nominal rate | Floating |  |  |  |

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