Operating Profit Disclosures Continuing Operations - Summary of Auditor's Remuneration (Parenthetical) (Detail) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Auditor's remuneration [Abstract]
Auditors Remuneration	€ 20	€ 19	€ 19
Ernst and Young [Member]
Auditor's remuneration [Abstract]
Auditors Remuneration	0	0	0
Other than EY [Member]
Auditor's remuneration [Abstract]
Auditors Remuneration	€ 2	€ 2	€ 2

The amount of fees paid or payable to the entity's auditors for auditing services.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2016-01-13
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_112_c&doctype=Standard
-URIDate 2016-03-31

Name:	ifrs-full_AuditorsRemunerationForAuditServices
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration