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PENSION AND OTHER POSTRETIREMENT PLANS (Details 4)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Target allocations for Plan assets
Percentage of Plan Assets	100.00%	100.00%
Cash Equivalents
Target allocations for Plan assets
Percentage of Plan Assets	8.10%	3.00%
Weighted-Average Expected Long-term Rate of Return (as a percent)	0.00%
Cash Equivalents | Minimum
Target allocations for Plan assets
Target Allocation 2018 (as a percent)	0.00%
Cash Equivalents | Maximum
Target allocations for Plan assets
Target Allocation 2018 (as a percent)	5.00%
Equity Securities
Target allocations for Plan assets
Percentage of Plan Assets	58.70%	64.00%
Weighted-Average Expected Long-term Rate of Return (as a percent)	10.00%
Equity Securities | Minimum
Target allocations for Plan assets
Target Allocation 2018 (as a percent)	45.00%
Equity Securities | Maximum
Target allocations for Plan assets
Target Allocation 2018 (as a percent)	65.00%
Fixed income securities
Target allocations for Plan assets
Percentage of Plan Assets	33.20%	33.00%
Weighted-Average Expected Long-term Rate of Return (as a percent)	5.00%
Fixed income securities | Minimum
Target allocations for Plan assets
Target Allocation 2018 (as a percent)	35.00%
Fixed income securities | Maximum
Target allocations for Plan assets
Target Allocation 2018 (as a percent)	55.00%

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- Definition

Represents the weighted-average expected long-term rate of return on target allocations for plan assets.

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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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