POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - RECONCILIATION OF BENEFIT OBLIGATIONS AND PLAN ASSETS (Details) - USD ($) $ in Millions		12 Months Ended
		Jun. 30, 2016		Jun. 30, 2015		Jun. 30, 2014
Pension Plan
CHANGE IN BENEFIT OBLIGATION
Defined Benefit Plan, Benefit Obligation, Beginning of Year	[1],[2]	$ 15,951		$ 17,053
Defined Benefit Plan, Service Cost		314	[2]	317	[2]	$ 298
Defined Benefit Plan, Interest Cost		466	[2]	545	[2]	590
Defined Benefit Plan, Contributions by Plan Participants	[2]	17		19
Defined Benefit Plan, Plan Amendments	[2]	8		17
Defined Benefit Plan, Actuarial Gain (Loss)	[2]	1,927		524
Defined Benefit Plan, Acquisitions (Divestitures), Benefit Obligation	[2]	(21)		7
Defined Benefit Plan, Special Termination Benefits	[2]	6		11
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)	[2]	(826)		(1,908)
Defined Benefit Plan, Benefits Paid	[2]	(557)		(634)
Defined Benefit Plan, Benefit Obligation, End of Year	[1],[2]	17,285		15,951		17,053
CHANGE IN PLAN ASSETS
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Year	[2]	10,605		11,098
Defined Benefit Plan, Actual Return on Plan Assets	[2]	630		1,016
Defined Benefit Plan Acquisitions Divestitures Plan Assets	[2]	(13)		0
Defined Benefit Plan, Contributions by Employer	[2]	306		262
Defined Benefit Plan, Contributions by Plan Participants	[2]	17		19
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	[2]	(719)		(1,156)
Defined Benefit Plan, ESOP Debt Servicing	[2],[3]	0		0
Defined Benefit Plan, Benefits Paid	[2]	(557)		(634)
Defined Benefit Plan, Fair Value of Plan Assets, End of Year	[2]	10,269		10,605		11,098
Disposal Group, Including Discontinued Operation, Pension Plan Benefit Obligation	[2]	402		336
Defined Benefit Plan, Funded Status of Plan	[2]	(6,614)		(5,010)
Other Retiree Benefits
CHANGE IN BENEFIT OBLIGATION
Defined Benefit Plan, Benefit Obligation, Beginning of Year	[1],[4]	4,904		5,505
Defined Benefit Plan, Service Cost		124	[4]	156	[4]	149
Defined Benefit Plan, Interest Cost		219	[4]	240	[4]	256
Defined Benefit Plan, Contributions by Plan Participants	[4]	74		71
Defined Benefit Plan, Plan Amendments	[4]	(40)		(325)
Defined Benefit Plan, Actuarial Gain (Loss)	[4]	589		(399)
Defined Benefit Plan, Acquisitions (Divestitures), Benefit Obligation	[4]	(7)		0
Defined Benefit Plan, Special Termination Benefits	[4]	12		23
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)	[4]	(14)		(134)
Defined Benefit Plan, Benefits Paid	[4]	(229)		(233)
Defined Benefit Plan, Benefit Obligation, End of Year	[1],[4]	5,632		4,904		5,505
CHANGE IN PLAN ASSETS
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Year	[4]	3,470		3,574
Defined Benefit Plan, Actual Return on Plan Assets	[4]	408		10
Defined Benefit Plan Acquisitions Divestitures Plan Assets	[4]	0		0
Defined Benefit Plan, Contributions by Employer	[4]	32		18
Defined Benefit Plan, Contributions by Plan Participants	[4]	74		71
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	[4]	(8)		(6)
Defined Benefit Plan, ESOP Debt Servicing	[3],[4]	40		36
Defined Benefit Plan, Benefits Paid	[4]	(229)		(233)
Defined Benefit Plan, Fair Value of Plan Assets, End of Year	[4]	3,787		3,470		$ 3,574
Disposal Group, Including Discontinued Operation, Pension Plan Benefit Obligation	[4]	16		0
Defined Benefit Plan, Funded Status of Plan	[4]	$ (1,829)		$ (1,434)

[1] For the pension benefit plans, the benefit obligation is the projected benefit obligation. For other retiree benefit plans, the benefit obligation is the accumulated postretirement benefit obligation.

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

[3] Represents the net impact of ESOP debt service requirements, which is netted against plan assets for other retiree benefits.

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