Income Taxes - Provision for income taxes from continuing operations (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Current:
Federal	$ 970	$ 253	$ 399
State	208	93	121
Foreign	86	31	17
Total current	1,264	377	537
Deferred:
Federal	(559)	85	(33)
State	(99)	18	(11)
Foreign	(1)	(4)	1
Total deferred	(659)	99	(43)
Total provision for income taxes	$ 605	$ 476	$ 494