Income Taxes - Schedule of Differences between the U.S. statutory rate and the aggregate income tax provision (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Income Tax Disclosure [Abstract]
Income tax provision at U.S. Federal statutory rate	$ 291	$ 239	$ 199
State income tax benefit, net of the U.S. Federal benefit	10	24	(3)
Foreign income taxed at rates different from the U.S. statutory rate	(34)	(12)	22
Valuation allowance adjustment	(15)	1	(38)
Tax effect of non-deductible stock-based compensation	25	38	34
Stock compensation (windfall) / shortfall	(28)	2	10
Research and development tax credit benefit	(18)	(17)	(12)
Closure of income tax audits and changes in uncertain tax positions	52	13	11
Tax effect of officer compensation in excess of $1 million	9	8	10
Non-deductible expenses	5	2	1
GILTI and Foreign derived intangible income	(30)	(39)	(106)
Acquisition-related integrations	1	(29)	(2)
Other	4	0	(3)
Income tax provision	272	$ 230	$ 123
First $1M of officer compensation	$ 1