POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023		Jun. 30, 2022		Jun. 30, 2021
Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined Benefit Plan, Service Cost	$ 173	[1]	$ 253	[1]	$ 275
Defined Benefit Plan, Interest Cost	430	[1]	253	[1]	240
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(591)		(684)		(783)
Defined Benefit Plan, Amortization of Gain (Loss)	133		337		423
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	26		28		25
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	0		(5)		5
Defined Benefit Plan, Other Cost (Credit)	5		4		17
Defined Benefit Plan Gross Periodic Benefit Cost	176		186		202
Employee Stock Ownership Plan (ESOP), Dividends on ESOP Preferred Stock	0		0		0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	176		186		202
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	4		(2,150)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	8		5
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	(133)		(337)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	(26)		(28)
Other Comprehensive Income Defined Benefit Plan Settlement And Curtailment Cost Before Tax	0		5
Other Comprehensive Income, Defined Benefit Plan, Currency Translation and Other, Before Tax	45		(486)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	(102)		(2,991)
Defined Benefit Plans, Amount Recognized In Periodic Benefit Cost And Accumulated Other Comprehensive Income	74		(2,805)
Other Retiree Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined Benefit Plan, Service Cost	71	[2]	86	[2]	94
Defined Benefit Plan, Interest Cost	142	[2]	99	[2]	114
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(611)		(564)		(508)
Defined Benefit Plan, Amortization of Gain (Loss)	(7)		11		47
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(125)		(107)		(60)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	0		0		0
Defined Benefit Plan, Other Cost (Credit)	4		1		2
Defined Benefit Plan Gross Periodic Benefit Cost	(526)		(474)		(311)
Employee Stock Ownership Plan (ESOP), Dividends on ESOP Preferred Stock	0		0		(8)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(526)		(474)		$ (319)
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	(79)		(548)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	0		(586)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	7		(11)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	125		107
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	0		13
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	53		(1,025)
Defined Benefit Plans, Amount Recognized In Periodic Benefit Cost And Accumulated Other Comprehensive Income	$ (473)		$ (1,499)

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

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