Revenue recognition - Schedule of Total Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2025	Jun. 30, 2025
Revenue from Contract with Customer [Abstract]
Contract assets, current (included within Other current assets)	$ 177	$ 149
Contract assets, noncurrent (included within Other long-term assets)	19	16
Total contract assets	196	165
Contract liabilities, current (included within Other current liabilities)	(198)	(211)
Contract liabilities, noncurrent (included within Other long-term liabilities)	(106)	(71)
Total contract liabilities	(304)	(282)
Net contract liabilities	$ (108)	$ (117)