Investments in Joint Ventures - Additional information (Detail) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of joint ventures [Line Items]
Disposals	€ 211
Investments in joint ventures	1,745	€ 1,712	€ 1,614
Carrying value of joint ventures investment net of provision	1,729	1,693
Negative carrying value of joint ventures investment reclassified to Provisions	16	18
Amvest [member]
Disclosure of joint ventures [Line Items]
Disposals	211
Investments in joint ventures	€ 1,001	€ 1,008

Carrying value of iInvestments in joint ventures reclassified to provisions.

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- Definition

Investments in joint ventures disposals.

+ References

No definition available.

+ Details

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- Definition

Investments in joint ventures net of carrying values reclassified to provisions.

+ References

No definition available.

+ Details

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- 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

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- Definition

The amount of investments in joint ventures in an entity's separate financial statements. [Refer: Joint ventures [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2018-01-01
-Paragraph 10
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2018-03-01&anchor=para_10&doctype=Standard
-URIDate 2018-03-16

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