Property, plant and equipment - Text details (Detail) - EUR (€) € in Millions	Dec. 31, 2017	Dec. 31, 2016
Property, plant and equipment [Abstract]
Land	€ 50	€ 73
Finance lease assets included in property, plant and equipment	281	271
Operating lease payments for sale-and-leaseback arrangements	€ 31	€ 32

The amount of assets recognised by the entity, which are leased under finance leases.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 17
-IssueDate 2017-01-01
-Paragraph 31
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_31_a&doctype=Standard&book=B
-URIDate 2017-03-09

Name:	ifrs-full_RecognisedFinanceLeaseAsAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant