Other intangible assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Jul. 31, 2025	Jul. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,385	$ 2,244
Accumulated Amortization	$ (1,659)	(1,491)
Software
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful life (years)	2 years
Gross Carrying Amount	$ 315	300
Accumulated Amortization	$ (252)	(223)
Customer relationships intangible assets
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful life (years)	7 years
Gross Carrying Amount	$ 1,568	1,452
Accumulated Amortization	$ (959)	(855)
Trade name intangible assets
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful life (years)	4 years
Gross Carrying Amount	$ 279	273
Accumulated Amortization	$ (246)	(224)
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful life (years)	3 years
Gross Carrying Amount	$ 223	219
Accumulated Amortization	$ (202)	$ (189)