POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - RECONCILIATION OF BENEFIT OBLIGATIONS AND PLAN ASSETS (Details) - USD ($) $ in Millions		12 Months Ended
		Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2015
Pension Plan
CHANGE IN BENEFIT OBLIGATION
Defined Benefit Plan, Benefit Obligation, Beginning of Year	[1],[2]	$ 17,285		$ 15,951
Defined Benefit Plan, Service Cost	[3]	310	[2]	314	[2]	$ 317
Defined Benefit Plan, Interest Cost		300	[2]	466	[2]	545
Defined Benefit Plan, Contributions by Plan Participants	[2]	14		17
Defined Benefit Plan, Plan Amendments	[2]	2		8
Defined Benefit Plan, Actuarial Gain (Loss)	[2]	(643)		1,927
Defined Benefit Plan, Acquisitions (Divestitures), Benefit Obligation	[2],[4]	(413)		(21)
Defined Benefit Plan, Curtailments	[2]	(132)		0
Defined Benefit Plan, Special Termination Benefits	[2]	4		6
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)	[2]	35		(826)
Defined Benefit Plan, Benefits Paid	[2]	(602)		(557)
Defined Benefit Plan, Benefit Obligation, End of Year	[1],[2]	16,160		17,285		15,951
CHANGE IN PLAN ASSETS
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Year	[2]	10,269		10,605
Defined Benefit Plan, Actual Return on Plan Assets	[2]	884		630
Defined Benefit Plan Acquisitions Divestitures Plan Assets	[2],[4]	(34)		(13)
Defined Benefit Plan, Contributions by Employer	[2]	316		306
Defined Benefit Plan, Contributions by Plan Participants	[2]	14		17
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	[2]	(18)		(719)
Defined Benefit Plan, ESOP Debt Servicing	[2],[5]	0		0
Defined Benefit Plan, Benefits Paid	[2]	(602)		(557)
Defined Benefit Plan, Fair Value of Plan Assets, End of Year	[2]	10,829		10,269		10,605
Disposal Group, Including Discontinued Operation, Pension Plan Benefit Obligation	[2]	0		402
Defined Benefit Plan, Funded Status of Plan	[2]	(5,331)		(6,614)
Other Retiree Benefits
CHANGE IN BENEFIT OBLIGATION
Defined Benefit Plan, Benefit Obligation, Beginning of Year	[1],[6]	5,632		4,904
Defined Benefit Plan, Service Cost	[3]	133	[6]	124	[6]	156
Defined Benefit Plan, Interest Cost		175	[6]	219	[6]	240
Defined Benefit Plan, Contributions by Plan Participants	[6]	74		74
Defined Benefit Plan, Plan Amendments	[6]	0		(40)
Defined Benefit Plan, Actuarial Gain (Loss)	[6]	(554)		589
Defined Benefit Plan, Acquisitions (Divestitures), Benefit Obligation	[4],[6]	(31)		(7)
Defined Benefit Plan, Curtailments	[6]	(37)		0
Defined Benefit Plan, Special Termination Benefits	[6]	21		12
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)	[6]	16		(14)
Defined Benefit Plan, Benefits Paid	[6]	(242)		(229)
Defined Benefit Plan, Benefit Obligation, End of Year	[1],[6]	5,187		5,632		4,904
CHANGE IN PLAN ASSETS
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Year	[6]	3,787		3,470
Defined Benefit Plan, Actual Return on Plan Assets	[6]	136		408
Defined Benefit Plan Acquisitions Divestitures Plan Assets	[4],[6]	0		0
Defined Benefit Plan, Contributions by Employer	[6]	36		32
Defined Benefit Plan, Contributions by Plan Participants	[6]	74		74
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	[6]	(4)		(8)
Defined Benefit Plan, ESOP Debt Servicing	[5],[6]	44		40
Defined Benefit Plan, Benefits Paid	[6]	(242)		(229)
Defined Benefit Plan, Fair Value of Plan Assets, End of Year	[6]	3,831		3,787		$ 3,470
Disposal Group, Including Discontinued Operation, Pension Plan Benefit Obligation	[6]	0		16
Defined Benefit Plan, Funded Status of Plan	[6]	$ (1,356)		$ (1,829)

[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] Service cost includes amounts related to discontinued operations, which are not material for any period.

[4] For the year ended June 30, 2017, this represents the obligations and plans which were classified as held for sale at June 30, 2016.

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

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