XML 95 R87.htm IDEA: XBRL DOCUMENT v3.20.2

BORROWINGS - Currency Concentration of Total Borrowings (Details) - EUR (€) € in Millions	Jun. 30, 2020	Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]
Borrowings	€ 2,536	€ 2,361
U.S. Dollars
Disclosure of detailed information about borrowings [line items]
Borrowings	1,757	1,597
Euro
Disclosure of detailed information about borrowings [line items]
Borrowings	741	746
Other currencies
Disclosure of detailed information about borrowings [line items]
Borrowings	€ 38	€ 18

X

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_Borrowings
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_CurrencyAxis=currency_USD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CurrencyAxis=currency_EUR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CurrencyAxis=cstm_OtherCurrenciesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: