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Benefit Plans - Pension plan asset weighted average asset allocation (Details) - Pension Plan	Dec. 31, 2018	Dec. 31, 2017
US
Weighted average asset allocation
Weighted average asset allocation (as a percent)	100.00%	100.00%
US | Equity securities
Weighted average asset allocation
Weighted average asset allocation (as a percent)	19.00%	26.00%
US | Equity securities | Minimum
Plan assets
Plan assets allocation percentage	15.00%
US | Equity securities | Maximum
Plan assets
Plan assets allocation percentage	25.00%
US | Debt securities - Fixed income
Weighted average asset allocation
Weighted average asset allocation (as a percent)	80.00%	73.00%
US | Debt securities - Fixed income | Minimum
Weighted average asset allocation
Weighted average asset allocation (as a percent)	75.00%
US | Debt securities - Fixed income | Maximum
Weighted average asset allocation
Weighted average asset allocation (as a percent)	85.00%
US | Cash and other
Weighted average asset allocation
Weighted average asset allocation (as a percent)	1.00%	1.00%
Non-US
Weighted average asset allocation
Weighted average asset allocation (as a percent)	100.00%	100.00%
Non-US | Equity securities
Weighted average asset allocation
Weighted average asset allocation (as a percent)	16.00%	39.00%
Non-US | Debt securities - Fixed income
Weighted average asset allocation
Weighted average asset allocation (as a percent)	64.00%	46.00%
Non-US | Cash and other
Weighted average asset allocation
Weighted average asset allocation (as a percent)	20.00%	15.00%

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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