Segment and net sales information - Depreciation and Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2023
Segment Reporting Information [Line Items]
Total capital expenditures	$ 305	$ 372	$ 441
Total depreciation and amortization	373	335	321
Amortization of acquired intangible assets	156	144	133
United States | Operating Segments
Segment Reporting Information [Line Items]
Total capital expenditures	300	353	423
Total depreciation and amortization	356	323	313
Canada | Operating Segments
Segment Reporting Information [Line Items]
Total capital expenditures	5	19	18
Total depreciation and amortization	$ 17	$ 12	$ 8