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Parent Company - Statement of Cash Flows of Constellium N.V. (Parent Company Only) (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of condensed financial information of parent company [Line Items] |  |  |
Net loss | € (31) | € (4) | € (552)
Adjustments |  |  |
Finance costs-net | 243 | 167 | 155
Changes in working capital: |  |  |
Trade receivables and other | (91) | 28 | 343
Trade payables and other | 124 | (18) | (161)
Net cash flows (used in) / from investing activities | (292) | (365) | (722)
Proceeds from issuance of Senior Notes | 1,440 | 375 |
Repayment of Senior Notes | (1,559) | (148) |
Other | 10 | 8 | 45
Net cash flows from / (used in) financing activities | 61 | 145 | (165)
Net (decrease) / increase in cash and cash equivalents | (71) | (132) | (519)
Cash and cash equivalents-beginning of period | 347 | 472 | 991
Effect of exchange rate changes on cash and cash equivalents | (7) | 3 | 4
Cash and cash equivalents as reported in the Consolidated Statement of Financial Position | 269 | 347 | 472
Parent [member] |  |  |
Disclosure of condensed financial information of parent company [Line Items] |  |  |
Net loss | (70) | (6) |
Adjustments |  |  |
Finance costs-net | 65 | (1) | (9)
Dividend received | 0 | 0 | 0
Interest paid | (148) | (95) | (61)
Interest received | 149 | 103 | 74
Changes in working capital: |  |  |
Trade receivables and other | (1) |  | 26
Other financial liabilities |  |  | (1)
Trade payables and other | 2 | (1) | (44)
Net cash flows used in operating activities | (3) |  | (15)
Investments in subsidiaries | (11) |  |
Current account with subsidiary (for cash pooling) | 180 | (186) | 17
Loans granted to subsidiary and related parties | (1,640) | (375) |
Repayment of loans granted to subsidiary and related parties | 823 | 181 |
Exit fees received from Subsidiaries | 9 |  |
Net cash flows (used in) / from investing activities | (639) | (380) | 17
Net proceeds received from issuance of shares | 259 |  |
Proceeds from issuance of Senior Notes | 1,440 | 375 |
Payment of deferred financing costs | (29) | (12) | (2)
Repayment of Senior Notes | (949) |  |
Payment of exit fees | (61) |  |
Realized foreign exchange gains / (losses) | (17) | 17 |
Other | (1) |  |
Net cash flows from / (used in) financing activities | 642 | 380 | (2)
Net (decrease) / increase in cash and cash equivalents | 0 | 0 | 0
Cash and cash equivalents-beginning of period | 0 | 0 | 0
Effect of exchange rate changes on cash and cash equivalents | 0 | 0 | 0
Cash and cash equivalents as reported in the Consolidated Statement of Financial Position | € 0 | € 0 | € 0

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