Revenue recognition - Schedule of Total Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025
Revenue from Contract with Customer [Abstract]
Contract assets, current (included within Other current assets)	$ 168	$ 149
Contract assets, noncurrent (included within Other long-term assets)	16	16
Total contract assets	184	165
Contract liabilities, current (included within Other current liabilities)	(211)	(211)
Contract liabilities, noncurrent (included within Other long-term liabilities)	(67)	(71)
Total contract liabilities	(278)	(282)
Net contract liabilities	$ (94)	$ (117)