Segment and net sales information - Items not Allocated (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2023
Net sales:
Total net sales	$ 30,762	$ 29,635	$ 29,734
Cost of sales:
Cost of sales	(21,327)	(20,582)	(20,709)
Adjusted operating profit:
Adjusted operating profit:	2,906	2,880	2,968
Central and other costs	(64)	(56)	(51)
Restructuring and impairment expenses	(80)	(28)	(125)
Amortization of acquired intangible assets	(156)	(144)	(133)
Interest expense, net	(190)	(179)	(184)
Other expense, net	7	(9)	(11)
Income before income taxes	2,423	2,464	2,464
United States
Net sales:
Total net sales	29,269	28,195	28,291
Cost of sales:
Cost of sales	(20,238)	(19,528)	(19,650)
Operating costs:
Operating cost	(6,191)	(5,847)	(5,749)
Adjusted operating profit:
Adjusted operating profit:	2,840	2,820	2,892
Canada
Net sales:
Total net sales	1,493	1,440	1,443
Cost of sales:
Cost of sales	(1,089)	(1,054)	(1,059)
Operating costs:
Operating cost	(338)	(326)	(308)
Adjusted operating profit:
Adjusted operating profit:	$ 66	$ 60	$ 76