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Trade Payables and Other - Detailed information of contract liabilities (Detail) - EUR (€) € in Millions	Jun. 30, 2018	Jan. 01, 2018
Disclosure of disaggregation of contract liabilities with customers [line items]
Non-current	€ 21	€ 32
Current	48	49
Deferred Tooling Revenue [member]
Disclosure of disaggregation of contract liabilities with customers [line items]
Non-current	12	14
Advance Payment From Customers [member]
Disclosure of disaggregation of contract liabilities with customers [line items]
Non-current	9	18
Current	9	9
Prepayment From Customer [member]
Disclosure of disaggregation of contract liabilities with customers [line items]
Current	2	1
Unrecognized Variable Consideration [Member]
Disclosure of disaggregation of contract liabilities with customers [line items]
Current	€ 37	€ 39

X

- Definition

Line items representing disaggregation of contract liabilities with customers.

+ References

No definition available.

+ Details

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Namespace Prefix:	cstm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of current contract liabilities. [Refer: Contract liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 15
-IssueDate 2017-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2017-03-01&anchor=para_105&doctype=Standard
-URIDate 2017-03-09

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of non-current contract liabilities. [Refer: Contract liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 15
-IssueDate 2017-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2017-03-01&anchor=para_105&doctype=Standard
-URIDate 2017-03-09

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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- Details

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- Details

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- Details

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