XML 490 R79.htm IDEA: XBRL DOCUMENT
v3.22.0.1

OPERATING SEGMENT INFORMATION - Segment Capital Expenditures (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of operating segments [line items] |  |  |
Capital expenditures | € (232) | € (182) | € (271)
P&ARP |  |  |
Disclosure of operating segments [line items] |  |  |
Capital expenditures | (94) | (73) | (96)
A&T |  |  |
Disclosure of operating segments [line items] |  |  |
Capital expenditures | (70) | (45) | (72)
AS&I |  |  |
Disclosure of operating segments [line items] |  |  |
Capital expenditures | (62) | (61) | (97)
H&C |  |  |
Disclosure of operating segments [line items] |  |  |
Capital expenditures | € (6) | € (3) | € (6)

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfOperatingSegmentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash outflow for the purchases of property, plant and equipment, classified as investing activities. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 16 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_16_a&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_SegmentsAxis=cstm_PackagingAndAutomotiveRolledProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cstm_AerospaceAndTransportationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cstm_AutomotiveStructuresAndIndustryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cstm_HoldingsAndCorporateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |