POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - Reconciliation Of Benefit Obligations And Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Pension Benefits
CHANGE IN BENEFIT OBLIGATION
Benefit obligation, beginning balance	$ 12,355	$ 12,499
Service cost	173	164	$ 173
Interest cost	498	527	430
Participants' contributions	15	14
Amendments	12	21
Net actuarial loss/(gain)	(263)	(11)
Special termination benefits	3	4
Currency translation and other	980	(155)
Benefit payments	(617)	(707)
Benefit obligation, ending balance	13,156	12,355	12,499
CHANGE IN PLAN ASSETS
Fair value of plan assets, beginning balance	10,857	10,374
Actual return on plan assets	326	1,058
Employer contributions	189	239
Participants' contributions	15	14
Currency translation and other	903	(119)
ESOP debt impacts	0	0
Benefit payments	(617)	(707)
Fair value of plan assets, ending balance	11,672	10,857	10,374
FUNDED STATUS	(1,484)	(1,498)
Other Retiree Benefits
CHANGE IN BENEFIT OBLIGATION
Benefit obligation, beginning balance	2,687	2,933
Service cost	61	68	71
Interest cost	147	157	142
Participants' contributions	56	56
Amendments	(4)	2
Net actuarial loss/(gain)	679	(268)
Special termination benefits	2	3
Currency translation and other	17	(22)
Benefit payments	(250)	(242)
Benefit obligation, ending balance	3,396	2,687	2,933
CHANGE IN PLAN ASSETS
Fair value of plan assets, beginning balance	8,043	7,324
Actual return on plan assets	(168)	784
Employer contributions	42	44
Participants' contributions	56	56
Currency translation and other	0	0
ESOP debt impacts	64	77
Benefit payments	(250)	(242)
Fair value of plan assets, ending balance	7,787	8,043	$ 7,324
FUNDED STATUS	$ 4,391	$ 5,356