Business realignment - Schedule of Business Realignment Charges and Workforce Reductions by Business Segment (Details) $ in Millions	3 Months Ended
	Sep. 30, 2025 USD ($) employee	Sep. 30, 2024 USD ($) employee
Operating Segments | Diversified Industrial
Restructuring Cost and Reserve [Line Items]
Business realignment charges	$ 14	$ 9
Work force reduction (in employees) | employee	190	327
Operating Segments | Aerospace Systems
Restructuring Cost and Reserve [Line Items]
Business realignment charges	$ 1	$ 0
Work force reduction (in employees) | employee	25	0
Other expense, net
Restructuring Cost and Reserve [Line Items]
Business realignment charges	$ 0	$ 1