POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - FAIR VALUE OF PLAN ASSETS - ADDITIONAL INFORMATION (Details) - Pension Plan - USD ($) $ in Millions		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	$ 10,829	$ 10,269	$ 10,605
Other Assets | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[2]	165	166
Other Assets | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[2]	$ 165	$ 166

[1] Primarily non-U.S.-based defined benefit retirement plans.

[2] The Company's other pension plan assets measured at fair value are generally classified as Level 3 within the fair value hierarchy. There are no material other pension plan asset balances classified as Level 1 or Level 2 within the fair value hierarchy.