POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - RECONCILIATION OF BENEFIT PLANS RECOGNIZED IN THE BALANCE SHEET (Details) - USD ($) $ in Millions		12 Months Ended
		Jun. 30, 2023	Jun. 30, 2022
Pension Plan
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Assets for Plan Benefits, Defined Benefit Plan		$ 1,085	$ 765
Liability, Defined Benefit Plan, Current		(94)	(61)
Liability, Defined Benefit Plan, Noncurrent		(3,116)	(3,139)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position		(2,125)	(2,435)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax		1,818	1,906
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax		156	170
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax		1,974	2,076
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	[1],[2]	8	5
Other Retiree Benefits
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Assets for Plan Benefits, Defined Benefit Plan		5,119	4,525
Liability, Defined Benefit Plan, Current		(38)	(34)
Liability, Defined Benefit Plan, Noncurrent		(690)	(672)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position		4,391	3,819
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax		(1,160)	(1,093)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax		(787)	(907)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax		(1,947)	(2,000)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	[1],[3]	$ 0	$ (586)

[1] For the other retiree benefits, the amendment primarily relates to adjustments in the self-insured U.S. retiree health care program to utilize fully-insured Medicare Advantage Programs impacting fiscal year 2022.

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

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