Income Taxes - Differences between income taxes calculated using the federal statutory income tax rate and the provision for income taxes from continuing operations (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022
Operating Loss Carryforwards [Line Items]
Income before income taxes	$ 3,550	$ 2,989	$ 2,542
Statutory federal income tax	746	628	534
State income tax, net of federal benefit	83	86	87
Federal research and experimentation credits	(109)	(106)	(94)
Share-based compensation	43	58	45
Excess tax benefits related to share-based compensation	(183)	(32)	(134)
Effects of non-U.S. operations	0	(28)	4
Other, net	(23)	(7)	12
Total provision for income taxes	$ 587	$ 605	$ 476