Goodwill and intangible assets - Schedule of Gross Carrying Value and Accumulated Amortization for Each Category of Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 11,885	$ 11,365
Accumulated Amortization	4,125	3,991
Patents and technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,349	2,134
Accumulated Amortization	580	556
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,090	1,037
Accumulated Amortization	512	499
Customer relationships and other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,446	8,194
Accumulated Amortization	$ 3,033	$ 2,936