Other income, net - Schedule of Components of Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Other Income and Expenses [Abstract]
Foreign currency transaction (gain) loss	$ (7)	$ 37
Income related to equity method investments	(58)	(38)
Non-service components of retirement benefit cost (income)	(17)	(12)
Loss (gain) on disposal of assets and divestitures	1	(9)
Interest income	(5)	(3)
Gain on insurance recoveries	(20)	0
Other items, net	(1)	(6)
Total other income, net	$ (107)	$ (31)