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PARENT COMPANY - Statement of Comprehensive Income / (Loss) of Constellium SE (parent company only) (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of condensed financial information of parent company [line items]      
Revenue € 4,883 € 5,907 € 5,686
Gross profit 490 602 538
Selling and administrative expenses (237) (276) (247)
Employee benefit expenses (902) (1,038) (927)
Income from operations 125 255 404
Finance costs - net (159) (175) (149)
(Loss) / income before income tax (34) 82 222
Income tax benefit 17 (18) (32)
Net (loss) / income (17) 64 190
Other comprehensive (loss) / income (14) (49) 7
Total comprehensive (loss) / income (31) 15 197
Parent      
Disclosure of condensed financial information of parent company [line items]      
Revenue 3 3 3
Gross profit 3 3 3
Selling and administrative expenses (14) (19) (15)
Employee benefit expenses (3) (3) (3)
Loss from recurring operations (14) (19) (15)
Other income 0 0 0
Other expense 0 (3) (3)
Income from operations (14) (22) (18)
Finance costs - net 31 41 80
(Loss) / income before income tax 17 19 62
Income tax benefit 15 18 25
Net (loss) / income 32 37 87
Other comprehensive (loss) / income 0 0 0
Total comprehensive (loss) / income € 32 € 37 € 87