POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2016		Jun. 30, 2015		Jun. 30, 2014
Pension Plan
AMOUNTS RECOGNIZED IN NET PERIODIC BENEFIT COST
Defined Benefit Plan, Service Cost	$ 314	[1]	$ 317	[1]	$ 298
Defined Benefit Plan, Interest Cost	466	[1]	545	[1]	590
Defined Benefit Plan, Expected Return on Plan Assets	(731)		(732)		(701)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	29		30		26
Defined Benefit Plan, Amortization of Gains (Losses)	265		275		214
Defined Benefit Plan, Other Costs	6		11		5
Defined Benefit Plan Gross Periodic Benefit Cost	349		446		432
Employee Stock Ownership Plan (ESOP), Dividends Paid to ESOP	0		0		0
Defined Benefit Plan, Net Periodic Benefit Cost	349		446		432
CHANGE IN PLAN ASSETS AND BENEFIT OBLIGATIONS RECOGNIZED IN AOCI
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	2,028		240
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax	8		17
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	(265)		(275)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax	(29)		(30)
Other Comprehensive Income, Defined Benefit Plan, Currency Translation and Other, Before Tax	(172)		(677)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	1,570		(725)
Defined Benefit Plans, Amount Recognized In Periodic Benefit Cost And Accumulated Other Comprehensive Income	1,919		(279)
Other Retiree Benefits
AMOUNTS RECOGNIZED IN NET PERIODIC BENEFIT COST
Defined Benefit Plan, Service Cost	124	[2]	156	[2]	149
Defined Benefit Plan, Interest Cost	219	[2]	240	[2]	256
Defined Benefit Plan, Expected Return on Plan Assets	(416)		(406)		(385)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(52)		(20)		(20)
Defined Benefit Plan, Amortization of Gains (Losses)	78		105		118
Defined Benefit Plan, Other Costs	12		23		9
Defined Benefit Plan Gross Periodic Benefit Cost	(35)		98		127
Employee Stock Ownership Plan (ESOP), Dividends Paid to ESOP	(52)		(58)		(64)
Defined Benefit Plan, Net Periodic Benefit Cost	(87)		40		$ 63
CHANGE IN PLAN ASSETS AND BENEFIT OBLIGATIONS RECOGNIZED IN AOCI
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	597		(3)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax	(40)		(325)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	(78)		(105)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax	52		20
Other Comprehensive Income, Defined Benefit Plan, Currency Translation and Other, Before Tax	(3)		(34)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	528		(447)
Defined Benefit Plans, Amount Recognized In Periodic Benefit Cost And Accumulated Other Comprehensive Income	$ 441		$ (407)

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

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