Goodwill and intangible assets - Schedule of Changes in Carrying Amount of Goodwill (Details) $ in Millions	6 Months Ended
	Dec. 31, 2025 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 10,694
Acquisition	475
Foreign currency translation	(20)
Ending balance	11,149
Diversified Industrial Segment
Goodwill [Roll Forward]
Beginning balance	7,728
Acquisition	475
Foreign currency translation	(15)
Ending balance	8,188
Aerospace Systems Segment
Goodwill [Roll Forward]
Beginning balance	2,966
Acquisition	0
Foreign currency translation	(5)
Ending balance	$ 2,961