Revenue and segment information - Segment Results (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2025	Oct. 31, 2024
Net sales:
Total net sales	$ 8,169	$ 7,772
Cost of Goods and Services Sold [Abstract]
Cost of sales	(5,663)	(5,432)
Adjusted operating profit:
Adjusted operating profit:	822	720
Central and other costs	(14)	(14)
Corporate restructuring expenses	(2)	(3)
Amortization of acquired intangible assets	(35)	(38)
Interest expense, net	(46)	(46)
Other (expense) income, net	(13)	5
Income before income taxes	712	624
United States
Net sales:
Total net sales	7,757	7,369
Cost of Goods and Services Sold [Abstract]
Cost of sales	(5,361)	(5,136)
Operating Expenses [Abstract]
Operating Expenses	(1,590)	(1,536)
Adjusted operating profit:
Adjusted operating profit:	806	697
Canada
Net sales:
Total net sales	412	403
Cost of Goods and Services Sold [Abstract]
Cost of sales	(302)	(296)
Operating Expenses [Abstract]
Operating Expenses	(94)	(84)
Adjusted operating profit:
Adjusted operating profit:	$ 16	$ 23