Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	$ 415
Research and development tax credits	5
Valuation allowance	786	$ 733
Increase in unrecognized tax benefits	336	108	$ 153
Unrecognized tax benefits which would affect the effective tax rate	1,700	1,700	1,500
Recognized interest and penalties related to unrecognized tax benefits	89	29	48
Accrued interest and penalties related to unrecognized tax benefits	225	$ 136	$ 107
Foreign Tax Jurisdiction
Tax Credit Carryforward [Line Items]
Tax credit carryforward	164
California
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	480
Research and development tax credits	932
State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Tax credit carryforward	$ 75