Income tax - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Jul. 31, 2025	Jul. 31, 2024
Assets:
Deferred compensation	$ 97	$ 82
Tax loss carryforwards	92	90
Lease liabilities	460	404
Sales returns and other liabilities	146	106
Inventory	36	45
Capitalized research and development	114	82
Other	32	49
Total deferred tax assets	977	858
Valuation allowance	(129)	(128)
Total deferred tax assets, net of valuation allowance	848	730
Liabilities:
Right of use assets	(447)	(397)
Goodwill and intangible assets	(139)	(129)
Property, plant and equipment	(44)	(34)
Total deferred tax liabilities	(630)	(560)
Net deferred tax assets	$ 218	$ 170