Income tax - Schedule of Current Period Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2023
Current:
U.S. Federal	$ 458	$ 3	$ 0
U.S. State and Local	125
International	23
Total current	606	604	679
Deferred:
U.S. Federal	(36)	155	17
U.S. State and Local	(7)
International	4
Total deferred	(39)	125	(104)
Provision for income taxes	$ 567	$ 729	$ 575