Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022	Jan. 31, 2023
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term	6 years 1 month 6 days		6 years 1 month 6 days		6 years 6 months
Weighted average discount rate	2.77%		2.77%		2.60%
Public income remaining lease term			8 years 3 months 18 days
Sublease income	$ 2	$ 2	$ 6	$ 3
Sublease income payments			73
Sublease income payments, expect to receive, remaining fiscal 2024 through fiscal 2028	35		35
Sublease income payments, expect to receive, thereafter	$ 38		$ 38
Minimum
Lessee, Lease, Description [Line Items]
Operating lease remaining lease term	1 year		1 year
Lease renewal term	1 year		1 year
Optional termination period	1 year		1 year
Maximum
Lessee, Lease, Description [Line Items]
Operating lease remaining lease term	66 years		66 years
Lease renewal term	9 years		9 years
Optional termination period	6 years		6 years