XML 444 R33.htm IDEA: XBRL DOCUMENT
v3.22.0.1

COVID-19-RELATED GOVERNMENT ASSISTANCE | 12 Months Ended
--- | ---
Dec. 31, 2021
Government Grants [Abstract] |
COVID-19-RELATED GOVERNMENT ASSISTANCE | NOTE 26 - COVID-19-RELATED GOVERNMENT ASSISTANCE In the year ended December 31, 2020, the Group received government assistance in various forms, including government-guaranteed credit facilities in France, Germany, and Switzerland (see NOTE 19 - Borrowings), as well as subsidies to compensate for the cost of employees furloughed as a result of the COVID-19 pandemic in various jurisdictions. These subsidies were recognized where there was reasonable assurance that they would be received and the Company was able to meet all of the associated conditions. For the year ended December 31, 2020, COVID-19-related subsidies in the amount of €22 million were accounted for as a deduction of employee benefit expenses.

X
- Definition Government Assistance + References No definition available. + Details
Name: | cstm_GovernmentGrantsAbstract
Namespace Prefix: | cstm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for government grants. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 20 -IssueDate 2021-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=20&code=ifrs-tx-2021-en-r&doctype=Standard&dita_xref=IAS20_g39-39_TI -URIDate 2021-03-24 + Details
Name: | ifrs-full_DisclosureOfGovernmentGrantsExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration