PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Plan Asset Allocations) (Details)	Sep. 30, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Total assets	100.00%	100.00%
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total assets	1.00%	5.00%
Equity securities | Pooled separate accounts
Defined Benefit Plan Disclosure [Line Items]
Total assets	4.00%	5.00%
Equity securities | Common collective trusts funds
Defined Benefit Plan Disclosure [Line Items]
Total assets	47.00%	56.00%
Fixed income securities | Pooled separate accounts
Defined Benefit Plan Disclosure [Line Items]
Total assets	4.00%	4.00%
Fixed income securities | Common collective trusts funds
Defined Benefit Plan Disclosure [Line Items]
Total assets	40.00%	30.00%
Real estate | Common collective trusts funds
Defined Benefit Plan Disclosure [Line Items]
Total assets	4.00%	0.00%