Revenue recognition - Schedule of Revenues by Market Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Revenues from contracts	$ 19,850	$ 19,930	$ 19,065
Aerospace Systems
Disaggregation of Revenue [Line Items]
Revenues from contracts	6,185	5,472	4,360
Commercial OEM | Aerospace Systems
Disaggregation of Revenue [Line Items]
Revenues from contracts	1,915	1,779	1,462
Commercial aftermarket | Aerospace Systems
Disaggregation of Revenue [Line Items]
Revenues from contracts	2,214	1,814	1,364
Defense OEM | Aerospace Systems
Disaggregation of Revenue [Line Items]
Revenues from contracts	1,138	1,125	905
Defense aftermarket | Aerospace Systems
Disaggregation of Revenue [Line Items]
Revenues from contracts	$ 918	$ 754	$ 629