Income Taxes - Differences between the U.S. statutory rate and the aggregate income tax provision (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
Income Tax Disclosure [Abstract]
Income tax provision at U.S. Federal statutory rate	$ 239	$ 199	$ 119
State income tax benefit, net of the U.S. Federal benefit	24	(3)	2
Foreign income taxed at rates different from the U.S. statutory rate	(12)	22	(25)
Valuation allowance adjustment	1	(38)	0
Tax effect of non-deductible stock-based compensation	38	34	32
Stock compensation (windfall) / shortfall	2	10	(43)
Research and development tax credit benefit	(17)	(12)	(19)
Closure of income tax audits and changes in uncertain tax positions	13	11	0
Tax effect of officer compensation in excess of $1 million	8	10	7
Non-deductible expenses	2	1	5
Global intangible low-taxed income, foreign derived intangible income and other	(39)	(106)	24
India withholding tax refund	0	0	(44)
Acquisition-related integrations	(29)	(2)	9
Other	0	(3)	1
Income tax provision	230	$ 123	$ 68
First $1M of officer compensation	$ 1