Income Taxes - Components of deferred tax assets and liabilities (Details) - USD ($) $ in Millions	Jul. 31, 2021	Jul. 31, 2020
Deferred tax assets:
Accruals and reserves not currently deductible	$ 48	$ 23
Operating lease liabilities	113	64
Accrued and deferred compensation	132	112
Loss and tax credit carryforwards	282	114
Intangible assets	33	26
Share-based compensation	59	44
Other, net	16	13
Total gross deferred tax assets	683	396
Valuation allowance	(205)	(132)
Total deferred tax assets	478	264
Deferred tax liabilities:
Deferred revenue	32	68
Operating lease right-of-use assets	96	55
Intangibles	844	45
Property and equipment	10	22
Other, net	13	11
Total deferred tax liabilities	995	201
Net deferred tax liabilities	(517)
Net deferred tax asset		63
Deferred Tax Assets, Net [Abstract]
Long-term deferred income taxes	8	65
Long-term deferred income tax liabilities	$ (525)	$ (2)