Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Jan. 31, 2025	Jan. 31, 2024
Deferred tax assets:
Losses and deductions carryforward	$ 209	$ 176
Deferred stock-based compensation expense	237	219
Tax credits	769	760
Accrued liabilities	482	419
Intangible assets	1,694	1,899
Lease liabilities	740	818
Unearned revenue	(28)
Unearned revenue		37
Capitalized research & development	2,431	1,710
Other	65	81
Total deferred tax assets	6,599	6,119
Less valuation allowance	(786)	(733)
Deferred tax assets, net of valuation allowance	5,813	5,386
Deferred tax liabilities:
Capitalized costs to obtain revenue contracts	(850)	(873)
Purchased intangible assets	(650)	(1,030)
Depreciation and amortization	(164)	(263)
Basis difference on strategic and other investments	(106)	(181)
Lease right-of-use assets	(554)	(636)
Total deferred tax liabilities	(2,324)	(2,983)
Net deferred tax assets (liabilities)	$ 3,489	$ 2,403