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Trade Receivables and Other - Additional Information (Detail) |  | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 EUR (€) | Jun. 30, 2018 USD ($) | Jun. 30, 2018 EUR (€) | Jun. 30, 2017 EUR (€) | Dec. 31, 2017 EUR (€)
Disclosure of trade and other receivables [line items] |  |  |  |  |
Reversal of impairment allowance |  |  | € 400,000 | € 400,000 |
Factored assets | € 680,000,000 |  | 680,000,000 |  | € 642,000,000
Factored assets, derecognized from Unaudited Interim Consolidated Statement of Financial Position | 466,000,000 |  | 466,000,000 |  | 473,000,000
Factored assets, recognized in Unaudited Interim Consolidated Statement of Financial Position | 214,000,000 |  | 214,000,000 |  | 169,000,000
Debt due factor | € 1,000,000 |  | € 1,000,000 |  | € 0
Factoring of receivables [member] | Muscle Shoals factoring facility [member] |  |  |  |  |
Disclosure of trade and other receivables [line items] |  |  |  |  |
Factoring maximum capacity | $ |  | $ 375,000,000 |  |  |
Trade receivable factoring agreement maturity date | Jan. 24, 2020 | Jan. 24, 2020 |  |  |
France [member] | Factoring of receivables [member] |  |  |  |  |
Disclosure of trade and other receivables [line items] |  |  |  |  |
Factoring maximum capacity | € 235,000,000 |  |  |  |
Trade receivable factoring agreement maturity date | Oct. 29, 2021 | Oct. 29, 2021 |  |  |
Germany Switzerland and Czech Republic [member] | Factoring of receivables [member] |  |  |  |  |
Disclosure of trade and other receivables [line items] |  |  |  |  |
Factoring maximum capacity | € 150,000,000 |  |  |  |
Trade receivable factoring agreement maturity date | Oct. 29, 2021 | Oct. 29, 2021 |  |  |
United States [member] | Factoring of receivables [member] | Constellium automotive [member] |  |  |  |  |
Disclosure of trade and other receivables [line items] |  |  |  |  |
Factoring maximum capacity | $ |  | $ 25,000,000 |  |  |
Trade receivable factoring agreement maturity date | Dec. 12, 2018 | Dec. 12, 2018 |  |  |

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