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COVER
 12 Months Ended
Dec. 31, 2023
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2023
Current Fiscal Year End Date --12-31
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-35931
Entity Registrant Name Constellium SE
Entity Incorporation, State or Country Code I0
Entity Address, Address Line One Washington Plaza,
Entity Address, Address Line Two 40-44 rue Washington
Entity Address, Postal Zip Code 75008
Entity Address, City or Town Paris
Entity Address, Country FR
Title of 12(b) Security Ordinary Shares
Trading Symbol CSTM
Security Exchange Name NYSE
Entity Common Stock, Shares Outstanding 146,819,884
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Financial Statement Error Correction [Flag] false
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Amendment Flag false
Document Fiscal Year Focus 2023
Document Fiscal Period Focus FY
Entity Central Index Key 0001563411
Other Address  
Document Information [Line Items]  
Entity Address, Address Line One 300 East Lombard Street
Entity Address, Address Line Two Suite 1710
Entity Address, Postal Zip Code 21202
Entity Address, City or Town Baltimore
Entity Address, State or Province MD
Entity Address, Country US
Chief Securities Counsel  
Document Information [Line Items]  
Entity Address, Address Line One 300 East Lombard Street
Entity Address, Address Line Two Suite 1710
Entity Address, Postal Zip Code 21202
Entity Address, City or Town Baltimore
Entity Address, State or Province MD
Entity Address, Country US
Local Phone Number 420-7861
City Area Code 443
Contact Personnel Name Rina E. Teran
Contact Personnel Email Address E-mail: rina.teran@constellium.com