| BENEFIT PLANS (Weighted-Average Assumptions used to Determine Benefit Obligations) (Details) | Dec. 31, 2017 | Dec. 31, 2016 | 
|---|---|---|
| Pension Benefits | ||
| Weighted-average assumptions used to determine benefit obligations at December 31, | ||
| Discount rate | 3.73% | 4.23% | 
| Rate of compensation increase | 4.88% | 4.80% | 
| Other Benefits | ||
| Weighted-average assumptions used to determine benefit obligations at December 31, | ||
| Discount rate | 3.60% | 3.98% | 
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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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. No definition available. 
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