Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022	Jan. 31, 2023
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term	6 years 3 months 18 days		6 years 3 months 18 days		6 years 6 months
Weighted average discount rate	2.79%		2.79%		2.60%
Public income remaining lease term			8 years 7 months 6 days
Sublease income	$ 2	$ 1	$ 4	$ 1
Sublease income payments			75
Sublease income payments, expect to receive, remaining fiscal 2023 through fiscal 2027	37		37
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	67 years		67 years
Lease renewal term	9 years		9 years
Optional termination period	7 years		7 years