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Income Taxes - Narrative (Detail) - USD ($)	12 Months Ended
Income Taxes - Narrative (Detail) - USD ($)	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Tax Credit Carryforward [Line Items]
Valuation allowance	$ 1,433,000,000	$ 1,259,000,000
Increase (decrease) of valuation allowance on net deferred tax assets	174,000,000	77,000,000
Income tax examination, penalties and interest expense	5,000,000	0	$ 0
Unrecognized tax benefits	341,000,000	$ 309,000,000	$ 253,000,000	$ 196,000,000
Unrecognized tax benefits that would impact effective tax rate	199,000,000
Federal
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	299,000,000
Federal \| Research Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	470,000,000
State
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	1,400,000,000
State \| Research Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	461,000,000
Foreign
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	$ 4,300,000,000