POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - AMOUNTS EXPECTED TO BE AMORTIZED FROM ACCUMULATED OTHER COMPREHENSIVE INCOME INTO NET PERIODIC BENEFIT COST (Details) - Subsequent Event $ in Millions	12 Months Ended
	Jun. 30, 2018 USD ($)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Future Amortization of Gain (Loss)	$ 289
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit)	28
Other Retiree Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Future Amortization of Gain (Loss)	67
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit)	$ (35)