Business realignment - Schedule of Business Realignment Charges and Workforce Reductions by Business Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Operating Segments | Diversified Industrial
Restructuring Cost and Reserve [Line Items]
Business realignment charges	$ 24	$ 10	$ 51	$ 39
Operating Segments | Aerospace Systems
Restructuring Cost and Reserve [Line Items]
Business realignment charges	1	0	2	0
Corporate general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Business realignment charges	0	0	0	1
Other expense (income), net
Restructuring Cost and Reserve [Line Items]
Business realignment charges	$ 0	$ (1)	$ 0	$ 0