Goodwill and intangible assets - Schedule of Changes in Carrying Amount of Goodwill (Details) $ in Millions	9 Months Ended
	Mar. 31, 2026 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 10,694
Acquisition	477
Foreign currency translation	(75)
Ending balance	11,096
Diversified Industrial Segment
Goodwill [Roll Forward]
Beginning balance	7,728
Acquisition	477
Foreign currency translation	(57)
Ending balance	8,148
Aerospace Systems Segment
Goodwill [Roll Forward]
Beginning balance	2,966
Acquisition	0
Foreign currency translation	(18)
Ending balance	$ 2,948