Revenue recognition - Schedule of Total Revenue by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 5,174	$ 4,743	$ 10,258	$ 9,647
North America
Disaggregation of Revenue [Line Items]
Net sales	3,422	3,199	6,872	6,532
Europe
Disaggregation of Revenue [Line Items]
Net sales	1,019	897	1,979	1,832
Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales	680	596	1,296	1,176
Latin America
Disaggregation of Revenue [Line Items]
Net sales	$ 53	$ 51	$ 111	$ 107