Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Jan. 31, 2023
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term	6 years 4 months 24 days		6 years 6 months
Weighted average discount rate	2.80%		2.60%
Public income remaining lease term	8 years 9 months 18 days
Sublease income	$ 2	$ 0
Sublease income payments	85
Sublease income payments, expect to receive, remaining fiscal 2023 through fiscal 2027	46
Sublease income payments, expect to receive, thereafter	$ 39
Minimum
Lessee, Lease, Description [Line Items]
Operating lease remaining lease term	1 year
Lease renewal term	1 year
Optional termination period	1 year
Maximum
Lessee, Lease, Description [Line Items]
Operating lease remaining lease term	67 years
Lease renewal term	9 years
Optional termination period	7 years