POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - Reconciliation Of Benefit Plans Recognized In The Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2024	Jun. 30, 2023
Pension Benefits
CLASSIFICATION OF NET AMOUNT RECOGNIZED
Noncurrent assets	$ 1,458	$ 1,085
Current liabilities	(73)	(94)
Noncurrent liabilities	(2,884)	(3,116)
NET AMOUNT RECOGNIZED	(1,498)	(2,125)
AMOUNTS RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE (INCOME)/LOSS (AOCI)
Net actuarial loss/(gain)	1,258	1,818
Prior service cost/(credit)	140	156
NET AMOUNTS RECOGNIZED IN AOCI	1,398	1,974
Other Retiree Benefits
CLASSIFICATION OF NET AMOUNT RECOGNIZED
Noncurrent assets	6,047	5,119
Current liabilities	(38)	(38)
Noncurrent liabilities	(653)	(690)
NET AMOUNT RECOGNIZED	5,356	4,391
AMOUNTS RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE (INCOME)/LOSS (AOCI)
Net actuarial loss/(gain)	(1,493)	(1,160)
Prior service cost/(credit)	(655)	(787)
NET AMOUNTS RECOGNIZED IN AOCI	$ (2,148)	$ (1,947)