POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - COMPONENTS OF NET PERIODIC BENEFIT COST - ADDITIONAL INFORMATION (Details) - Other Postretirement Benefit Plan - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018		Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Other Cost (Credit)	$ 8	$ 7	[1]	$ 21
Discontinued Operations
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Other Cost (Credit)		$ 18

[1] For fiscal year ended June 30, 2017, amortization of net actuarial loss/prior service cost due to settlement and curtailments and $18 of the special termination benefits are included in Net earnings from discontinued operations.