Pension Plans and Similar Obligations - Actuarial Assumptions (Details)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Post Employment Plans
Pension Plans and Similar Obligations
Discount rates	4.20%	3.90%	4.00%
Germany
Pension Plans and Similar Obligations
Discount rates	2.30%	2.30%	2.10%
Foreign
Pension Plans and Similar Obligations
Discount rates	1.00%	0.80%	0.60%

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard
-URIDate 2018-03-16

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