POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2022		Jun. 30, 2021		Jun. 30, 2020
Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined Benefit Plan, Service Cost	$ 253	[1]	$ 275	[1]	$ 247
Defined Benefit Plan, Interest Cost	253	[1]	240	[1]	276
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(684)		(783)		(740)
Defined Benefit Plan, Amortization of Gain (Loss)	337		423		340
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	28		25		25
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	5		(5)		(7)
Defined Benefit Plan, Other Cost (Credit)	4		17		11
Defined Benefit Plan Gross Periodic Benefit Cost	186		202		166
Employee Stock Ownership Plan (ESOP), Dividends on ESOP Preferred Stock	0		0		0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	186		202		166
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	(2,150)		(741)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	5		34
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	(337)		(423)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	(28)		(25)
Other Comprehensive Income Defined Benefit Plan Settlement And Curtailment Cost Before Tax	5		(5)
Other Comprehensive Income, Defined Benefit Plan, Currency Translation and Other, Before Tax	(486)		367
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	(2,991)		(793)
Defined Benefit Plans, Amount Recognized In Periodic Benefit Cost And Accumulated Other Comprehensive Income	(2,805)		(591)
Other Retiree Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined Benefit Plan, Service Cost	86	[2]	94	[2]	100
Defined Benefit Plan, Interest Cost	99	[2]	114	[2]	160
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(564)		(508)		(473)
Defined Benefit Plan, Amortization of Gain (Loss)	11		47		68
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(107)		(60)		(48)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	0		0		0
Defined Benefit Plan, Other Cost (Credit)	1		2		2
Defined Benefit Plan Gross Periodic Benefit Cost	(474)		(311)		(191)
Employee Stock Ownership Plan (ESOP), Dividends on ESOP Preferred Stock	0		(8)		(19)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(474)		(319)		$ (210)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	(548)		(1,049)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	(586)		0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	(11)		(47)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	107		60
Other Comprehensive Income Defined Benefit Plan Settlement And Curtailment Cost Before Tax	0		0
Other Comprehensive Income, Defined Benefit Plan, Currency Translation and Other, Before Tax	13		0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	(1,025)		(1,036)
Defined Benefit Plans, Amount Recognized In Periodic Benefit Cost And Accumulated Other Comprehensive Income	$ (1,499)		$ (1,355)

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

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