Goodwill and intangible assets - Schedule of Gross Carrying Value and Accumulated Amortization for Each Category of Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2025	Jun. 30, 2025
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 11,887	$ 11,365
Accumulated Amortization	4,277	3,991
Patents and technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,348	2,134
Accumulated Amortization	610	556
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,090	1,037
Accumulated Amortization	526	499
Customer relationships and other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,449	8,194
Accumulated Amortization	$ 3,141	$ 2,936