Other intangible assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Jul. 31, 2024	Jul. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,244	$ 2,105
Accumulated Amortization	$ (1,491)	(1,322)
Software
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful life (years)	3 years
Gross Carrying Amount	$ 300	283
Accumulated Amortization	$ (223)	(197)
Customer relationships intangible assets
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful life (years)	7 years
Gross Carrying Amount	$ 1,452	1,345
Accumulated Amortization	$ (855)	(750)
Trade name intangible assets
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful life (years)	3 years
Gross Carrying Amount	$ 273	268
Accumulated Amortization	$ (224)	(200)
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful life (years)	3 years
Gross Carrying Amount	$ 219	209
Accumulated Amortization	$ (189)	$ (175)