Income tax - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Jul. 31, 2024	Jul. 31, 2023
Assets:
Deferred compensation	$ 82	$ 69
Tax loss carryforwards	90	186
Lease liabilities	404	378
Sales returns and other liabilities	106	123
Inventory	45	46
Capitalized research and development	82	44
Other	49	48
Total deferred tax assets	858	894
Valuation allowance	(128)	(81)
Total deferred tax assets, net of valuation allowance	730	813
Liabilities:
Right of use assets	(397)	(374)
Goodwill and intangible assets	(129)	(118)
Property, plant and equipment	(34)	(21)
Total deferred tax liabilities	(560)	(513)
Net deferred tax assets	$ 170	$ 300