Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	$ 214
Valuation allowance	967	$ 786
Increase in unrecognized tax benefits	220	336	$ 108
Unrecognized tax benefits which would affect the effective tax rate	1,900	1,700	1,700
Recognized interest and penalties related to unrecognized tax benefits	69	89	29
Accrued interest and penalties related to unrecognized tax benefits	294	$ 225	$ 136
Non-US
Tax Credit Carryforward [Line Items]
Tax credit carryforward	214
California
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	480
Research and development tax credits	1,100
State and Local Tax Jurisdiction, Other
Tax Credit Carryforward [Line Items]
Tax credit carryforward	$ 70

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards.

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