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Share-Based Payments - Disclosure of Details of Breakdown of the Closing Balance BCE 2010 (Detail)	Dec. 31, 2017 EUR (€)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding	181,008	147,359	143,694
Exercisable	181,008	147,359	53,859
BCE2010 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding	11,005	12,339	15,974	29,972
Exercisable	11,005	12,339	15,974
Exercise price, Exercisable	€ 77

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.

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- Definition

The number of other equity instruments (ie other than share options) exercisable in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 2
-IssueDate 2017-01-01
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-URIDate 2017-03-09

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- Definition

The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
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-IssueDate 2017-01-01
-Paragraph 45
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- Definition

The weighted average exercise price of share options exercisable in a share-based payment arrangement. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-Subparagraph b
-Clause vii
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