POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - Reconciliation Of Benefit Plans Recognized In The Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2024
Pension Benefits
CLASSIFICATION OF NET AMOUNT RECOGNIZED
Noncurrent assets	$ 1,621	$ 1,458
Current liabilities	(78)	(73)
Noncurrent liabilities	(3,026)	(2,884)
NET AMOUNT RECOGNIZED	(1,484)	(1,498)
AMOUNTS RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE (INCOME)/LOSS (AOCI)
Net actuarial loss/(gain)	1,322	1,258
Prior service cost/(credit)	122	140
NET AMOUNTS RECOGNIZED IN AOCI	1,444	1,398
Other Retiree Benefits
CLASSIFICATION OF NET AMOUNT RECOGNIZED
Noncurrent assets	5,123	6,047
Current liabilities	(41)	(38)
Noncurrent liabilities	(691)	(653)
NET AMOUNT RECOGNIZED	4,391	5,356
AMOUNTS RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE (INCOME)/LOSS (AOCI)
Net actuarial loss/(gain)	166	(1,493)
Prior service cost/(credit)	(553)	(655)
NET AMOUNTS RECOGNIZED IN AOCI	$ (387)	$ (2,148)