Revenue and segment information - Items not Allocated (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024
Net sales:
Total net sales	$ 6,872	$ 6,673	$ 14,644	$ 14,381
Adjusted operating profit:
Central and other costs	(17)	(14)	(31)	(30)
Amortization of acquired intangible assets	(39)	(35)	(77)	(69)
Interest expense, net	(48)	(44)	(94)	(89)
Other income (expense), net	8	0	13	(3)
Income before income taxes	370	433	994	1,124
Corporate restructurings
Adjusted operating profit:
Corporate restructurings	0	(8)	(3)	(8)
United States
Net sales:
Total net sales	6,553	6,364	13,922	13,693
Adjusted operating profit:
Adjusted operating profit:	455	525	1,152	1,291
Canada
Net sales:
Total net sales	319	309	722	688
Adjusted operating profit:
Adjusted operating profit:	$ 11	$ 9	$ 34	$ 32