Revenue recognition - Schedule of Total Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2024
Revenue from Contract with Customer [Abstract]
Contract assets, current (included within Other current assets)	$ 149	$ 137
Contract assets, noncurrent (included within Other assets)	16	21
Total contract assets	165	158
Contract liabilities, current (included within Other accrued liabilities)	(211)	(184)
Contract liabilities, noncurrent (included within Other liabilities)	(71)	(78)
Total contract liabilities	(282)	(262)
Net contract liabilities	$ (117)	$ (104)