Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024
Amount
U.S. federal statutory tax rate	$ 337	$ 291	$ 239
State and local income taxes, net of federal income tax effect	13	10	24
Changes in valuation allowances	19	(15)	1
Other		4	0
Statutory tax rate difference		(34)	(12)
Net controlled foreign corporation tested income	164
Other effects on cross-border tax laws	(12)
Foreign tax credits	(73)
Research and development tax credits	(30)	(18)	(17)
Tax effect of non-deductible stock-based compensation	65	25	38
Other nontaxable or non-deductible items	13	5	2
Changes in unrecognized tax benefits	(30)
Stock compensation excess benefits	(29)
Income tax provision	$ 479	$ 272	$ 230
Percent
U.S. federal statutory tax rate	21.00%
State and local income taxes, net of federal income tax effect	1.00%
Changes in valuation allowances	1.00%
Net controlled foreign corporation tested income	10.00%
Other effects on cross-border tax laws	(1.00%)
Foreign tax credits	(5.00%)
Research and development tax credits	(2.00%)
Tax effect of non-deductible stock-based compensation	4.00%
Other nontaxable or non-deductible items	1.00%
Changes in unrecognized tax benefits	(2.00%)
Stock compensation excess benefits	(2.00%)
Income tax provision	30.00%
Australia
Amount
Other	$ (3)
Percent
Other	0.00%
Brazil
Amount
Withholding taxes	$ 20
Percent
Withholding taxes	1.00%
Ireland
Amount
Other	$ 20
Statutory tax rate difference	$ (74)
Percent
Other	1.00%
Statutory tax rate difference	(5.00%)
Other foreign jurisdictions
Amount
Statutory tax rate difference	$ (8)
Percent
Statutory tax rate difference	0.00%
United States
Amount
Other	$ 33
Withholding taxes	$ 54
Percent
Other	2.00%
Withholding taxes	3.00%