Leases - Schedule of Lease Costs and Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Oct. 31, 2025	Oct. 31, 2024
Leases [Abstract]
Cash paid for operating leases included in operating cash flows	$ 66	$ 70
Increase in operating lease liabilities arising from obtaining operating lease right-of-use assets and lease modifications	29	4
Variable lease payments	$ 8	$ 10