Income from operations - Sales and costs by nature (Detail Parenthetical) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income from operations [Abstract]
Lease-related fuel, electricity and taxes	€ 38	€ 30	€ 33
Government grants recognized	€ 90	€ 79	€ 58

The amount of income recognised in relation to government grants. [Refer: Government grants]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 20
-IssueDate 2017-01-01
-Paragraph 39
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=20&date=2017-03-01&anchor=para_39_b&doctype=Standard
-URIDate 2017-03-09

Name:	ifrs-full_RevenueFromGovernmentGrants
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration