Goodwill and intangible assets - Schedule of Gross Carrying Value and Accumulated Amortization for Each Category of Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2026	Jun. 30, 2025
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 11,826	$ 11,365
Accumulated Amortization	4,401	3,991
Patents and technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,338	2,134
Accumulated Amortization	636	556
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,085	1,037
Accumulated Amortization	536	499
Customer relationships and other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,403	8,194
Accumulated Amortization	$ 3,229	$ 2,936