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Business and Summary of Significant Accounting Policies - Stock Based Compensation Expense (Details) | 12 Months Ended
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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

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