Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Jan. 31, 2022	Jan. 31, 2021
Deferred tax assets:
Losses and deductions carryforward	$ 682	$ 202
Deferred stock-based expense	244	179
Tax credits	1,469	990
Accrued liabilities	300	269
Intangible assets	2,009	2,011
Lease liabilities	862	948
Unearned revenue	116	71
Other	32	17
Total deferred tax assets	5,714	4,687
Less valuation allowance	(463)	(305)
Deferred tax assets, net of valuation allowance	5,251	4,382
Deferred tax liabilities:
Capitalized costs to obtain revenue contracts	(817)	(581)
Purchased intangible assets	(1,902)	(833)
Depreciation and amortization	(178)	(121)
Basis difference on strategic and other investments	(337)	(400)
Lease right-of-use assets	(735)	(863)
Total deferred tax liabilities	(3,969)	(2,798)
Net deferred tax assets (liabilities)	$ 1,282	$ 1,584