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PARENT COMPANY INFORMATION - Statement of Cash Flows of Constellium SE (parent company only) (Details) - EUR (€)
€ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of condensed financial information of parent company [line items]        
Net income   € 262 € (17) € 64
Adjustments        
Finance costs - net   167 159 175
Income tax benefit   55 (17) 18
Change in working capital        
Trade receivables and other   (227) 36 104
Trade payables and other   396 (38) (31)
Interest paid   (128) (140) (158)
Income tax received   3 9 (6)
Net cash flows from operating activities   357 334 447
Net cash flows used in investing activities   (221) (176) (353)
Proceeds from issuance of Senior Notes € 290 712 290 0
Repayments of Senior Notes   (1,041) (200) (100)
Net cash flows (used in) / from financing activities   (435) 101 (76)
Net (decrease) / increase in cash and cash equivalents   (299) 259 18
Cash and cash equivalents - beginning of period 184 439 184 164
Cash and cash equivalents - end of year   147 439 184
Parent        
Disclosure of condensed financial information of parent company [line items]        
Net income   16 32 37
Adjustments        
Finance costs - net   (7) (31) (41)
Dividends received   0 0 0
Income tax benefit   (26) (15) (18)
Change in working capital        
Trade receivables and other   0 (2) 27
Trade payables and other   1 0 2
Interest paid   (100) (114) (115)
Interest received   114 139 143
Income tax received   7 18 50
Net cash flows from operating activities   5 27 85
Investments in subsidiaries   0 0 0
Current account with subsidiaries and related parties   3 29 (135)
Loans granted to subsidiaries and related parties   (892) (290) 0
Repayment of loans granted to subsidiaries and related parties   1,241 150 150
Net cash flows used in investing activities   352 (111) 15
Proceeds from issuance of Senior Notes   712 290 0
Repayments of Senior Notes   (1,041) (200) (100)
Payment of exit fees   (15) 0 0
Payment of deferred financing costs   (13) (6) 0
Realized foreign exchange gains / (losses)   0 0 0
Net cash flows (used in) / from financing activities   (357) 84 (100)
Net (decrease) / increase in cash and cash equivalents   0 0 0
Cash and cash equivalents - beginning of period € 0 0 0 0
Cash and cash equivalents - end of year   € 0 € 0 € 0