POSTRETIREMENT BENEFIT PLANS - Asset Allocation, Benefit Plans (Details) - Principal retiree benefit plans	Dec. 31, 2017
Global equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual allocation	62.00%
Debt securities (including cash equivalents)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual allocation	25.00%
Private equities & other investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual allocation	13.00%
Minimum \| Global equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation	54.00%
Minimum \| Debt securities (including cash equivalents)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation	16.00%
Minimum \| Private equities & other investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation	0.00%
Maximum \| Global equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation	74.00%
Maximum \| Debt securities (including cash equivalents)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation	55.00%
Maximum \| Private equities & other investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation	12.00%

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.

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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+ References

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