Income Taxes - Reconciliation of statutory Federal Income Tax Rate (Details) - USD ($) $ in Millions		12 Months Ended
		Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Income Tax Disclosure [Abstract]
U.S. federal taxes at statutory rate		$ 322	$ 538	$ 148
State, net of the federal benefit		(29)	90	40
Effects of non-U.S. operations		199	(1,817)	540
Tax credits		(263)	(125)	(195)
Non-deductible expenses		83	45	119
Excess tax benefits related to share-based compensation		(323)	(289)	(166)
Effect of U.S. tax law change		0	23	6
Change in valuation allowance		101	15	85
Other, net		(2)	9	3
Provision for (benefit from) income taxes	[1]	$ 88	$ (1,511)	$ 580

[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.