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PARENT COMPANY - Statement of Cash Flows of Constellium SE (parent company only) (Details) - EUR (€)
€ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of condensed financial information of parent company [line items]        
Net income   € (17) € 64 € 190
Adjustments        
Finance costs - net   159 175 149
Income tax benefit   (17) 18 32
Change in working capital        
Trade receivables and other   36 104 (145)
Trade payables and other   (38) (31) (27)
Interest paid   (140) (158) (129)
Income tax received   9 (6) (23)
Net cash flows from operating activities   334 447 66
Net cash flows used in investing activities   (176) (353) (91)
Proceeds from issuance of Senior Notes € 0 290 0 0
Repayment of Senior Notes   (200) (100) 0
Other financing activities   (8) 5 1
Net cash flows from / (used in) financing activities   101 (76) (82)
Net increase / (decrease) in cash and cash equivalents   259 18 (107)
Cash and cash equivalents - beginning of year 164 184 164 269
Effect of exchange rate changes on cash and cash equivalents   (4) 2 2
Cash and cash equivalents - end of year   439 184 164
Parent        
Disclosure of condensed financial information of parent company [line items]        
Net income   32 37 87
Adjustments        
Finance costs - net   (31) (41) (80)
Dividends received   0 0 0
Income tax benefit   (15) (18) (25)
Change in working capital        
Trade receivables and other   (2) 27 0
Trade payables and other   0 2 0
Interest paid   (114) (115) (102)
Interest received   139 143 134
Income tax received   18 50 0
Net cash flows from operating activities   27 85 14
Investments in subsidiaries   0 0 (1)
Current account with subsidiaries and related parties   29 (135) (13)
Loans granted to subsidiaries and related parties   (290) 0 0
Repayment of loans granted to subsidiaries and related parties   150 150 0
Exit fees received from subsidiaries   0 0 0
Net cash flows used in investing activities   (111) 15 (14)
Net proceeds received from issuance of shares   0 0 0
Proceeds from issuance of Senior Notes   290 0 0
Repayment of Senior Notes   (200) (100) 0
Payment of exit fees   0 0 0
Payment of deferred financing costs   (6) 0 0
Realized foreign exchange gains / (losses)   0 0 0
Other financing activities   0 0 0
Net cash flows from / (used in) financing activities   84 (100) 0
Net increase / (decrease) in cash and cash equivalents   0 0 0
Cash and cash equivalents - beginning of year € 0 0 0 0
Effect of exchange rate changes on cash and cash equivalents   0 0 0
Cash and cash equivalents - end of year   € 0 € 0 € 0