Other (income) expense, net (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Other Income and Expenses [Abstract]
Foreign currency transaction loss (gain)	$ 46	$ (38)	$ 46
Income related to equity method investments	(178)	(152)	(124)
Non-service components of retirement benefit cost	(51)	(73)	(67)
Interest income	(11)	(15)	(46)
Saegertown incident	8	0	0
Loss on deal-contingent forward contracts	0	0	390
Other items, net	3	2	(15)
Total other (income) expense, net	(183)	(276)	184
Sales to and services performed for joint venture	96	74	64
Cash dividends from joint ventures	$ 167	$ 148	$ 114