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PARENT COMPANY INFORMATION - Statement of Comprehensive Income / (Loss) of Constellium SE (parent company only) (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of condensed financial information of parent company [line items]      
Revenue € 6,152 € 4,883 € 5,907
Gross profit 664 490 602
Selling and administrative expenses (258) (237) (276)
Employee benefit expenses (967) (902) (1,038)
Income from operations 484 125 255
Financial result - net (167) (159) (175)
Income / (loss) before tax 317 (34) 82
Income tax benefit (55) 17 (18)
Net income / (loss) 262 (17) 64
Other comprehensive income / (loss) 119 (14) (49)
Total comprehensive income / (loss) 381 (31) 15
Parent      
Disclosure of condensed financial information of parent company [line items]      
Revenue 23 3 3
Gross profit 23 3 3
Selling and administrative expenses (36) (14) (19)
Employee benefit expenses (4) (3) (3)
Loss from recurring operations (17) (14) (19)
Other income 0 0 0
Other expense 0 0 (3)
Income from operations (17) (14) (22)
Financial result - net 7 31 41
Income / (loss) before tax (10) 17 19
Income tax benefit 26 15 18
Net income / (loss) 16 32 37
Other comprehensive income / (loss) 0 0 0
Total comprehensive income / (loss) € 16 € 32 € 37