Leases and Other Commitments - Narrative (Details) $ in Millions	12 Months Ended
	Jan. 31, 2022 USD ($)
Other Commitments [Line Items]
Operating lease extension term (some leases)	5 years
Operating lease termination option	1 year
Sublease income, next five years	$ 244
Sublease income, thereafter	78
Operating leases, not yet commenced	1,100
Operating lease commitment balance, including leases not yet commenced	5,200
Facilities Space
Other Commitments [Line Items]
Operating lease commitment balance, including leases not yet commenced	4,600
Letter of credit
Other Commitments [Line Items]
Value of outstanding letters of credit	$ 130
Minimum
Other Commitments [Line Items]
Operating lease term	1 year
Operating lease term, not yet commenced	3 years
Maximum
Other Commitments [Line Items]
Operating lease term	18 years
Operating lease term, not yet commenced	18 years