POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - Reconciliation Of Benefit Obligations And Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Pension Benefits
CHANGE IN BENEFIT OBLIGATION
Benefit obligation, beginning balance	$ 12,499	$ 12,608
Service cost	164	173	$ 253
Interest cost	527	430	253
Participants' contributions	14	13
Amendments	21	8
Net actuarial loss/(gain)	(11)	(550)
Special termination benefits	4	5
Currency translation and other	(155)	363
Benefit payments	(707)	(551)
Benefit obligation, ending balance	12,355	12,499	12,608
CHANGE IN PLAN ASSETS
Fair value of plan assets, beginning balance	10,374	10,173
Actual return on plan assets	1,058	37
Employer contributions	239	392
Participants' contributions	14	13
Currency translation and other	(119)	310
ESOP debt impacts	0	0
Benefit payments	(707)	(551)
Fair value of plan assets, ending balance	10,857	10,374	10,173
FUNDED STATUS	(1,498)	(2,125)
Other Retiree Benefits
CHANGE IN BENEFIT OBLIGATION
Benefit obligation, beginning balance	2,933	3,070
Service cost	68	71	86
Interest cost	157	142	99
Participants' contributions	56	50
Amendments	2	0
Net actuarial loss/(gain)	(268)	(208)
Special termination benefits	3	4
Currency translation and other	(22)	31
Benefit payments	(242)	(227)
Benefit obligation, ending balance	2,687	2,933	3,070
CHANGE IN PLAN ASSETS
Fair value of plan assets, beginning balance	7,324	6,889
Actual return on plan assets	784	482
Employer contributions	44	42
Participants' contributions	56	50
Currency translation and other	0	1
ESOP debt impacts	77	87
Benefit payments	(242)	(227)
Fair value of plan assets, ending balance	8,043	7,324	$ 6,889
FUNDED STATUS	$ 5,356	$ 4,391