Business realignment - Schedule of Business Realignment Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Cost of sales
Restructuring Cost and Reserve [Line Items]
Business realignment charges	$ 17	$ 4	$ 34	$ 21
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Business realignment charges	8	6	19	19
Other expense (income), net
Restructuring Cost and Reserve [Line Items]
Business realignment charges	$ 0	$ (1)	$ 0	$ 0