Revenue and segment information - Depreciation and Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022
Segment Reporting Information [Line Items]
Total capital expenditures	$ 372	$ 441	$ 290
Total depreciation and amortization	335	321	301
Amortization of acquired intangible assets	144	133	114
United States | Operating Segments
Segment Reporting Information [Line Items]
Total capital expenditures	353	423	283
Total depreciation and amortization	323	313	292
Canada | Operating Segments
Segment Reporting Information [Line Items]
Total capital expenditures	19	18	7
Total depreciation and amortization	$ 12	$ 8	$ 9