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Weighted Average Assumptions Used to Determine Benefit Obligation (Details)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.90%	4.45%	4.70%
Other Postretirement Employee Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.95%	4.30%	4.50%

X

- Definition

The interest rate used to adjust for the time value of money for the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

+ Details

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X

- Definition

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.

+ Details

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