POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - FAIR VALUE OF PLAN ASSETS (Details) - USD ($) $ in Millions		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Pension Plan
ASSETS AT FAIR VALUE
Defined Benefit Plan, Fair Value of Plan Assets	[1]	$ 10,269	$ 10,605	$ 11,098
Pension Plan | Cash and Cash Equivalents | Fair Value, Inputs, Level 1
ASSETS AT FAIR VALUE
Defined Benefit Plan, Fair Value of Plan Assets		262	266
Pension Plan | Cash and Cash Equivalents | Fair Value, Inputs, Level 2
ASSETS AT FAIR VALUE
Defined Benefit Plan, Fair Value of Plan Assets		262	266
Pension Plan | Trust for Benefit of Employees | Fair Value, Inputs, Level 2
ASSETS AT FAIR VALUE
Defined Benefit Plan, Fair Value of Plan Assets		4,381	5,054
Pension Plan | Fixed Income Funds | Fair Value, Inputs, Level 2
ASSETS AT FAIR VALUE
Defined Benefit Plan, Fair Value of Plan Assets		5,498	5,162
Pension Plan | Other Assets | Fair Value, Inputs, Level 1
ASSETS AT FAIR VALUE
Defined Benefit Plan, Fair Value of Plan Assets	[2]	128	123
Other Retiree Benefits
ASSETS AT FAIR VALUE
Defined Benefit Plan, Fair Value of Plan Assets	[3]	3,787	3,470	$ 3,574
Other Retiree Benefits | Cash and Cash Equivalents | Fair Value, Inputs, Level 1
ASSETS AT FAIR VALUE
Defined Benefit Plan, Fair Value of Plan Assets		70	36
Other Retiree Benefits | Company Stock | Fair Value, Inputs, Level 2
ASSETS AT FAIR VALUE
Defined Benefit Plan, Fair Value of Plan Assets	[4]	3,545	3,239
Other Retiree Benefits | Trust for Benefit of Employees | Fair Value, Inputs, Level 2
ASSETS AT FAIR VALUE
Defined Benefit Plan, Fair Value of Plan Assets		14	17
Other Retiree Benefits | Fixed Income Funds | Fair Value, Inputs, Level 2
ASSETS AT FAIR VALUE
Defined Benefit Plan, Fair Value of Plan Assets		$ 158	$ 178

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

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

[3] Primarily U.S.-based other postretirement benefit plans.

[4] Company stock is net of ESOP debt discussed below.