Pension and Postretirement Benefit Plans and Defined Contribution Plans - Healthcare Cost Trend Rate Assumptions (Details) - Postretirement Benefits Plan [Member]	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Healthcare cost trend rate assumed for next year (up to age 65)	6.10%	6.30%
Healthcare cost trend rate assumed for next year (age 65 and older)	7.00%	7.40%
Rate to which the cost trend rate is assumed to decline	4.50%	4.50%

Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, 65 Years of Age and Over

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- Definition

Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Under 65 Years of Age

+ References

No definition available.

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- 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.

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- Definition

Ultimate trend rate for health care cost for defined benefit postretirement 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 (l)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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