EMPLOYEE BENEFIT PLANS (Information for Retirement Income Plans with Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - Retirement Income Plans [Member] - Other Postretirement Benefits Plan [Member] - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 571	$ 611
Accumulated benefit obligation	571	610
Fair value of plan assets	$ 395	$ 409