BENEFIT PLANS (Narrative) (Details)	3 Months Ended		9 Months Ended
	Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 entity
Defined Benefit Plan Disclosure [Line Items]
Number of funded, noncontributory defined benefit pension plans			3
Number of unfunded, nonqualified pension plans			3
Normal retirement age			65 years
Discretionary Employer Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions | $	$ 100,000,000	$ 10,600,000