Employee Benefit Plans - Allocation of Plan Assets (Details)	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Target allocation	100.00%
Percentage of plan assets at end of period	100.00%	100.00%
US equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	20.00%
Percentage of plan assets at end of period	19.00%	21.00%
Non-US equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	30.00%
Percentage of plan assets at end of period	28.00%	29.00%
Fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	45.00%
Percentage of plan assets at end of period	46.00%	44.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Target allocation	5.00%
Percentage of plan assets at end of period	7.00%	6.00%

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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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- Definition

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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