Business and Summary of Significant Accounting Policies - Schedule of Computer Equipment, Software, Furniture and Leasehold Improvements, Net (Details) - USD ($) $ in Millions	Jan. 31, 2025	Jan. 31, 2024
Property, Plant and Equipment [Abstract]
Computer equipment, software, furniture, and leasehold improvements, gross	$ 578	$ 622
Less: Accumulated depreciation	(461)	(501)
Computer equipment, software, furniture, and leasehold improvements, net	117	121
Computer hardware, at cost
Property, Plant and Equipment [Abstract]
Computer equipment, software, furniture, and leasehold improvements, gross	103	117
Computer software, at cost
Property, Plant and Equipment [Abstract]
Computer equipment, software, furniture, and leasehold improvements, gross	42	48
Furniture and equipment, at cost
Property, Plant and Equipment [Abstract]
Computer equipment, software, furniture, and leasehold improvements, gross	100	100
Leasehold improvements, land and buildings, at cost
Property, Plant and Equipment [Abstract]
Computer equipment, software, furniture, and leasehold improvements, gross	$ 333	$ 357