Income Taxes - Provision for income taxes from continuing operations (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022
Current:
Federal	$ 984	$ 970	$ 253
State	202	208	93
Foreign	36	86	31
Total current	1,222	1,264	377
Deferred:
Federal	(523)	(559)	85
State	(97)	(99)	18
Foreign	(15)	(1)	(4)
Total deferred	(635)	(659)	99
Total provision for income taxes	$ 587	$ 605	$ 476