Property and Equipment - Schedule of property and equipment (Details) - USD ($) $ in Millions	Jul. 31, 2024	Jul. 31, 2023
Property, Plant and Equipment [Line Items]
Computer software	$ 810	$ 898
Buildings	636	382
Leasehold improvements	495	404
Equipment	177	214
Furniture and fixtures	141	104
Land	96	79
Capital in progress	17	360
Total property plant and equipment, gross	2,372	2,441
Less accumulated depreciation and amortization	(1,363)	(1,472)
Total property and equipment, net	$ 1,009	$ 969
Minimum
Property, Plant and Equipment [Line Items]
Life in years	2 years
Maximum
Property, Plant and Equipment [Line Items]
Life in years	30 years
Computer software | Minimum
Property, Plant and Equipment [Line Items]
Life in years	2 years
Computer software | Maximum
Property, Plant and Equipment [Line Items]
Life in years	6 years
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Life in years	5 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Life in years	30 years
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Life in years	2 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Life in years	16 years
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Life in years	3 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Life in years	5 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Life in years	5 years