Income Taxes - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
		Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Tax Credit Carryforward [Line Items]
Provision for income taxes	[1]	$ 88	$ (1,511)	$ 580
Deferred income tax benefit from intra-entity transfer of intangible property		0	2,003	0
Operating loss carryforwards		3,100
Research and development tax credits		1,100
Valuation allowance		463	305
Increase in unrecognized tax benefits		343	46	581
Unrecognized tax benefits which would affect the effective tax rate		1,300	1,300	1,200
Recognized interest and penalties related to unrecognized tax benefits		21	25	2
Accrued interest and penalties related to unrecognized tax benefits		58	$ 37	$ 12
Reasonably possible decrease of unrecognized tax benefits		15
Foreign Tax Authority
Tax Credit Carryforward [Line Items]
Tax credit carryforward		269
California
Tax Credit Carryforward [Line Items]
Operating loss carryforwards		1,400
Research and development tax credits		653
State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Operating loss carryforwards		1,500
Tax credit carryforward		$ 103

[1] During fiscal 2021, the Company recorded approximately $2.0 billion of a one-time benefit from a discrete tax item related to the recognition of deferred tax assets resulting from an intra-entity transfer of intangible property.