PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Plan Assumptions) (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Pension Plan [Member]
DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.46%	3.88%
DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	3.55%	3.35%
DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract
DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	3.93%	4.12%
DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	7.47%	7.81%
DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease	3.54%	3.35%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Year That Rate Reaches Ultimate Trend Rate Net Periodic	2026	2026
DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.54%	4.00%
DefinedBenefitPlanAssumedHealthCareCostTrendRatesAbstract
DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear	8.30%	8.25%
DefinedBenefitPlanUltimateHealthCareCostTrendRate	4.50%	4.50%
DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract
DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	4.02%	4.25%
Defined Benefit Plan Assumed Health Care Cost Trend Rates Net Periodic [Abstract]
Defined Benefit Plan Health Care Cost Trend Rate Assumed for Next Fiscal Year Net Periodic	8.25%	8.75%
Defined Benefit Plan Ultimate Health Care Cost Trend Rate Net Periodic	4.50%	4.50%