Benefit Plans - Weighted-Average Assumptions to Determine Postretirement Benefit Obligations (Details) - Postretirement Benefit Plans	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.37%	3.66%
Health care cost trend rate assumed for next year	6.25%	6.25%
Ultimate trend rate	5.00%	4.81%
Year that the rate reaches the ultimate trend rate	2024	2024
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.40%	4.24%
Health care cost trend rate assumed for next year	5.44%	5.56%
Ultimate trend rate	5.44%	5.56%
Year that the rate reaches the ultimate trend rate	2018	2018

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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- Definition

Ultimate trend rate for health care cost for defined benefit postretirement plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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Year ultimate health care cost trend rate is expected to be reached, in CCYY format.

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-Publisher FASB
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-Section 50
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