Computer Equipment, Software, Furniture, and Leasehold Improvements, Net (Details) - USD ($) $ in Millions	Oct. 31, 2024	Jan. 31, 2024
Property, Plant and Equipment [Line Items]
Computer equipment, software, furniture, and leasehold improvements, gross	$ 569	$ 622
Less: Accumulated depreciation	(453)	(501)
Computer equipment, software, furniture, and leasehold improvements, net	116	121
Computer hardware, at cost
Property, Plant and Equipment [Line Items]
Computer equipment, software, furniture, and leasehold improvements, gross	102	117
Computer software, at cost
Property, Plant and Equipment [Line Items]
Computer equipment, software, furniture, and leasehold improvements, gross	39	48
Furniture and equipment, at cost
Property, Plant and Equipment [Line Items]
Computer equipment, software, furniture, and leasehold improvements, gross	98	100
Leasehold improvements, land and buildings, at cost
Property, Plant and Equipment [Line Items]
Computer equipment, software, furniture, and leasehold improvements, gross	$ 330	$ 357