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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Employee Benefit Plans - Investment of Plan Assets (Details) - Pension	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of Plan Assets	100.00%	100.00%
Domestic equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of Plan Assets	39.00%	41.00%
International equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of Plan Assets	28.00%	26.00%
Domestic fixed income securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of Plan Assets	26.00%	26.00%
International fixed income securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of Plan Assets	5.00%	4.00%
Real estate fund
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of Plan Assets	2.00%	3.00%
Minimum \| Domestic equity securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target allocation range minimum, percent	35.00%
Minimum \| International equity securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target allocation range minimum, percent	20.00%
Minimum \| Domestic fixed income securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target allocation range minimum, percent	25.00%
Minimum \| International fixed income securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target allocation range minimum, percent	3.00%
Minimum \| Real estate fund
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target allocation range minimum, percent	2.00%
Maximum \| Domestic equity securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target allocation range minimum, percent	45.00%
Maximum \| International equity securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target allocation range minimum, percent	30.00%
Maximum \| Domestic fixed income securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target allocation range minimum, percent	29.00%
Maximum \| International fixed income securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target allocation range minimum, percent	7.00%
Maximum \| Real estate fund
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target allocation range minimum, percent	4.00%