Income Taxes - Provision for income taxes from continuing operations (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Current:
Federal	$ 253	$ 399	$ 372
State	93	121	79
Foreign	31	17	21
Total current	377	537	472
Deferred:
Federal	85	(33)	(47)
State	18	(11)	(47)
Foreign	(4)	1	(6)
Total deferred	99	(43)	(100)
Total provision for income taxes	$ 476	$ 494	$ 372