POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - Components Of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Pension Benefits
AMOUNTS RECOGNIZED IN NET PERIODIC BENEFIT COST/(CREDIT)
Service cost	$ 164	$ 173	$ 253
Interest cost	527	430	253
Expected return on plan assets	(610)	(591)	(684)
Amortization of net actuarial loss/(gain)	95	133	337
Amortization of prior service cost/(credit)	37	26	28
Amortization of net actuarial loss/(gain) due to settlements	(13)	0	(5)
Special termination benefits	4	5	4
NET PERIODIC BENEFIT COST/(CREDIT)	203	176	186
CHANGE IN PLAN ASSETS AND BENEFIT OBLIGATIONS RECOGNIZED IN AOCI
Net actuarial loss/(gain) - current year	(458)	4
Prior service cost/(credit) - current year	21	8
Amortization of net actuarial (loss)/gain	(95)	(133)
Amortization of prior service (cost)/credit	(37)	(26)
Amortization of net actuarial (loss)/gain due to settlements	13	0
Currency translation and other	(21)	45
TOTAL CHANGE IN AOCI	(576)	(102)
NET AMOUNTS RECOGNIZED IN PERIODIC BENEFIT COST/(CREDIT) AND AOCI	(373)	74
Other Retiree Benefits
AMOUNTS RECOGNIZED IN NET PERIODIC BENEFIT COST/(CREDIT)
Service cost	68	71	86
Interest cost	157	142	99
Expected return on plan assets	(687)	(611)	(564)
Amortization of net actuarial loss/(gain)	(38)	(7)	11
Amortization of prior service cost/(credit)	(127)	(125)	(107)
Amortization of net actuarial loss/(gain) due to settlements	0	0	0
Special termination benefits	3	4	1
NET PERIODIC BENEFIT COST/(CREDIT)	(623)	(526)	$ (474)
CHANGE IN PLAN ASSETS AND BENEFIT OBLIGATIONS RECOGNIZED IN AOCI
Net actuarial loss/(gain) - current year	(366)	(79)
Prior service cost/(credit) - current year	2	0
Amortization of net actuarial (loss)/gain	38	7
Amortization of prior service (cost)/credit	127	125
Amortization of net actuarial (loss)/gain due to settlements	0	0
Currency translation and other	(2)	0
TOTAL CHANGE IN AOCI	(201)	53
NET AMOUNTS RECOGNIZED IN PERIODIC BENEFIT COST/(CREDIT) AND AOCI	$ (824)	$ (473)