Computer Equipment, Software, Furniture, and Leasehold Improvements, Net (Details) - USD ($) $ in Millions	Jul. 31, 2025	Jan. 31, 2025
Property, Plant and Equipment [Line Items]
Computer equipment, software, furniture, and leasehold improvements, gross	$ 592	$ 578
Less: Accumulated depreciation	(483)	(461)
Computer equipment, software, furniture, and leasehold improvements, net	109	117
Computer hardware, at cost
Property, Plant and Equipment [Line Items]
Computer equipment, software, furniture, and leasehold improvements, gross	106	103
Computer software, at cost
Property, Plant and Equipment [Line Items]
Computer equipment, software, furniture, and leasehold improvements, gross	50	42
Furniture and equipment, at cost
Property, Plant and Equipment [Line Items]
Computer equipment, software, furniture, and leasehold improvements, gross	102	100
Leasehold improvements, land and buildings, at cost
Property, Plant and Equipment [Line Items]
Computer equipment, software, furniture, and leasehold improvements, gross	$ 334	$ 333