Goodwill and intangible assets - Schedule of Changes in Carrying Amount of Goodwill (Details) $ in Millions	3 Months Ended
	Sep. 30, 2025 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 10,694
Acquisition	472
Foreign currency translation	(25)
Ending balance	11,141
Diversified Industrial Segment
Goodwill [Roll Forward]
Beginning balance	7,728
Acquisition	472
Foreign currency translation	(19)
Ending balance	8,181
Aerospace Systems Segment
Goodwill [Roll Forward]
Beginning balance	2,966
Acquisition	0
Foreign currency translation	(6)
Ending balance	$ 2,960