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PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Target Allocation and Actual Asset Allocations for Pension and VEBA Plan Assets) (Details) | Dec. 31, 2017 | Dec. 31, 2016
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Pension Benefits [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Weighted-average asset allocation | 100.00% | 100.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 100.00% |
Pension Benefits [Member] | Equity Securities [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Weighted-average asset allocation | 43.60% | 43.20%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 45.00% |
Pension Benefits [Member] | Fixed Income Investments [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Weighted-average asset allocation | 27.00% | 26.40%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 28.00% |
Pension Benefits [Member] | Hedge Funds [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Weighted-average asset allocation | 5.00% | 5.90%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 5.00% |
Pension Benefits [Member] | Private Equity Funds [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Weighted-average asset allocation | 5.30% | 5.30%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 7.00% |
Pension Benefits [Member] | Structured Finance [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Weighted-average asset allocation | 9.70% | 9.30%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 7.50% |
Pension Benefits [Member] | Real Estate [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Weighted-average asset allocation | 8.70% | 9.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 7.50% |
Pension Benefits [Member] | Cash [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Weighted-average asset allocation | 0.70% | 0.90%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |
Other Benefits [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Weighted-average asset allocation | 100.00% | 100.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 100.00% |
Other Benefits [Member] | Equity Securities [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Weighted-average asset allocation | 8.70% | 8.40%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 8.00% |
Other Benefits [Member] | Fixed Income Investments [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Weighted-average asset allocation | 77.70% | 78.30%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 80.00% |
Other Benefits [Member] | Hedge Funds [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Weighted-average asset allocation | 4.40% | 4.40%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 4.00% |
Other Benefits [Member] | Private Equity Funds [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Weighted-average asset allocation | 1.50% | 1.70%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 3.00% |
Other Benefits [Member] | Structured Finance [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Weighted-average asset allocation | 3.00% | 2.70%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 2.00% |
Other Benefits [Member] | Real Estate [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Weighted-average asset allocation | 4.60% | 4.40%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 3.00% |
Other Benefits [Member] | Cash [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Weighted-average asset allocation | 0.10% | 0.10%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |

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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 + Details
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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 + Details
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