Principal Accountant Fees and Services (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosures
Audit fees	€ 10	€ 9	€ 9
Audit-related fees	0	1	0
Tax fees	0	0	0
All other fees	0	0	0
Total	10	10	9
Germany
Disclosures
Audit fees	3	3	3
Audit-related fees	0	0	0
Tax fees	0	0	0
All other fees	0	0	0
Total	3	3	3
Foreign
Disclosures
Audit fees	7	6	6
Audit-related fees	0	1	0
Tax fees	0	0	0
All other fees	0	0	0
Total	€ 7	€ 7	€ 6

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2017-03-09

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- Definition

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The amount of fees paid or payable to the entity's auditors for services that the entity does not separately disclose in the same statement or note.

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