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Property, Plant and Equipment - Summary of Movements in Property, Plant and Equipment (Parenthetical) (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	€ 10,411	€ 11,673
Spreads business [member]
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]
Reclassification as held for sale	548
Freehold land [Member]
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	€ 247	€ 249

X

- Definition

The decrease in property, plant and equipment through classification as held for sale or inclusion in a disposal group classified as held for sale. [Refer: Disposal groups classified as held for sale [member]; Property, plant and equipment; Disposal groups classified as held for sale [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2016-01-13
-Paragraph 73
-Subparagraph e
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_73_e_ii&doctype=Standard
-URIDate 2016-03-31

+ Details

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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

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X

- Definition

The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2016-01-13
-Paragraph 73
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_73_e&doctype=Standard
-URIDate 2016-03-31

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2016-01-13
-Paragraph 54
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_54_a&doctype=Standard
-URIDate 2016-03-31

+ Details

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X

- Details

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X

- Details

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