Business and Summary of Significant Accounting Policies - Stock Based Compensation Expense (Details)	12 Months Ended
	Jan. 31, 2024 USD ($) period	Jan. 31, 2023 USD ($)	Jan. 31, 2022 USD ($)
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan ("ESPP") purchases	$ 703,000,000	$ 660,000,000	$ 559,000,000
Tax expense (benefit)	2,000,000	13,000,000	(53,000,000)
Stock-based compensation expense related to stock awards and ESPP purchases, net	705,000,000	673,000,000	506,000,000
Market capitalization	$ 2,000,000,000
Number of exercise period | period	4
Term of exercise period	6 months
Term of offering period	24 months
Cash dividends paid	$ 0	0	0
Expected dividends	0.00%
Cost of other revenue | Cost of subscription and maintenance revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan ("ESPP") purchases	$ 37,000,000	34,000,000	25,000,000
Cost of other revenue | Cost of other revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan ("ESPP") purchases	14,000,000	12,000,000	10,000,000
Marketing and sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan ("ESPP") purchases	258,000,000	263,000,000	234,000,000
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan ("ESPP") purchases	308,000,000	266,000,000	220,000,000
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan ("ESPP") purchases	$ 86,000,000	$ 85,000,000	$ 70,000,000