Other expense (income), net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Other Income and Expenses [Abstract]
Foreign currency transaction (gain) loss	$ (14)	$ 10	$ (24)	$ 15
Income related to equity method investments	(53)	(49)	(162)	(126)
Non-service components of retirement benefit cost (income)	(17)	(12)	(50)	(37)
Gain on disposal of assets and divestitures	0	(5)	(8)	(262)
Interest income	(2)	(4)	(9)	(9)
Insurance-related charges (recoveries)	0	8	(20)	8
Other items, net	1	6	5	6
Total other expense (income), net	(85)	(46)	(268)	(405)
Sales to and services performed for equity method investments	$ 29	$ 27	82	69
Cash dividends from equity method investments			$ 161	$ 112