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.

No definition available.

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(i)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Pension and Other Postretirement Benefits - Schedule of Pension and Postretirement Plans Investment Policy and Weighted Average Asset Allocations (Detail)	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, asset allocations	100.00%	100.00%
Equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, asset allocations	28.00%	30.00%
Equities \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Policy range	55.00%
Equities \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Policy range	20.00%
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, asset allocations	47.00%	42.00%
Fixed income \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Policy range	55.00%
Fixed income \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Policy range	25.00%
Other investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, asset allocations	25.00%	28.00%
Other investments \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Policy range	35.00%
Other investments \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Policy range	15.00%