Revenue recognition - Schedule of Revenues by Market Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 5,084	$ 4,904
Aerospace Systems
Disaggregation of Revenue [Line Items]
Net sales	1,641	1,448
Commercial original equipment manufacturer ("OEM") | Aerospace Systems
Disaggregation of Revenue [Line Items]
Net sales	539	434
Commercial aftermarket | Aerospace Systems
Disaggregation of Revenue [Line Items]
Net sales	594	521
Defense OEM | Aerospace Systems
Disaggregation of Revenue [Line Items]
Net sales	294	262
Defense aftermarket | Aerospace Systems
Disaggregation of Revenue [Line Items]
Net sales	$ 214	$ 231