XML 63 R48.htm IDEA: XBRL DOCUMENT v3.25.3

SEGMENT INFORMATION - Segment Revenue Segment Cost and Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended					9 Months Ended		12 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
External revenue	$ 2,166			$ 1,802		$ 6,248	$ 5,614
Segment Adjusted EBITDA	196	$ 165	$ 147	131	$ 184	507	476	$ 575
A&T
Segment Reporting Information [Line Items]
External revenue	462			403		1,362	1,344
Cost of metal	(203)			(174)		(592)	(577)
Production costs	(142)			(154)		(438)	(464)
Other segment expenses	(26)			(21)		(76)	(68)
Segment Adjusted EBITDA	90	84	82	54	94	256	235	292
A&T | Segment revenue
Segment Reporting Information [Line Items]
External revenue	481			421		1,441	1,386
A&T | Inter-segment elimination
Segment Reporting Information [Line Items]
External revenue	(19)			(18)		(79)	(42)
P&ARP
Segment Reporting Information [Line Items]
External revenue	1,305			1,087		3,720	3,177
Cost of metal	(946)			(753)		(2,700)	(2,187)
Production costs	(246)			(239)		(720)	(725)
Other segment expenses	(30)			(24)		(83)	(79)
Segment Adjusted EBITDA	82	74	60	72	66	217	186	242
P&ARP | Segment revenue
Segment Reporting Information [Line Items]
External revenue	1,307			1,090		3,729	3,187
P&ARP | Inter-segment elimination
Segment Reporting Information [Line Items]
External revenue	(2)			(3)		(9)	(10)
AS&I
Segment Reporting Information [Line Items]
External revenue	399			312		1,163	1,089
Cost of metal	(224)			(180)		(686)	(595)
Production costs	(119)			(105)		(341)	(356)
Other segment expenses	(22)			(20)		(69)	(68)
Segment Adjusted EBITDA	33	18	16	7	30	67	70	74
AS&I | Segment revenue
Segment Reporting Information [Line Items]
External revenue	409			323		1,211	1,103
AS&I | Inter-segment elimination
Segment Reporting Information [Line Items]
External revenue	(10)			(11)		(48)	(14)
H&C
Segment Reporting Information [Line Items]
External revenue	1			0		3	4
Cost of metal	2			2		5	5
Production costs	(1)			(1)		(5)	(5)
Other segment expenses	(11)			(3)		(35)	(19)
Segment Adjusted EBITDA	(9)	$ (12)	$ (11)	(2)	$ (6)	(32)	(15)	$ (33)
H&C | Segment revenue
Segment Reporting Information [Line Items]
External revenue	1			0		3	4
H&C | Inter-segment elimination
Segment Reporting Information [Line Items]
External revenue	$ 0			$ 0		$ 0	$ 0

X

- Definition

Adjusted Earnings Before Interest, Taxes, Depreciation, And Amortization

+ References

No definition available.

+ Details

Name:	cstm_AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization
Namespace Prefix:	cstm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Cost Of Metal

+ References

No definition available.

+ Details

Name:	cstm_CostOfMetal
Namespace Prefix:	cstm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Other Expenses Including Selling, General, Administrative And Research And Development Costs

+ References

No definition available.

+ Details

Name:	cstm_OtherExpensesIncludingSellingGeneralAdministrativeAndResearchAndDevelopmentCosts
Namespace Prefix:	cstm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of expense related to the production and distribution of goods or services to customers and clients.

+ References

No definition available.

+ Details

Name:	us-gaap_ProductionAndDistributionCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-41

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482964/270-10-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (ee)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479941/924-10-S99-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-5

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-30

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-40

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-4

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=cstm_AerospaceAndTransportationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ConsolidationItemsAxis=us-gaap_IntersegmentEliminationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=cstm_PackagingAndAutomotiveRolledProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=cstm_AutomotiveStructuresAndIndustryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=cstm_HoldingCorporateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: