Cash Equivalents and Investments - Schedule of Amortized Costs, Unrealized Gains and Losses and Estimated Fair Value of Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Millions |
Jul. 31, 2026 |
Jan. 31, 2026 |
|---|---|---|
| Cash and Cash Equivalents [Line Items] | ||
| Total cash equivalents | $ 530 | $ 670 |
| Total short-term investments | 1,536 | 1,695 |
| Total | 2,066 | 2,365 |
| U.S. government securities (Level 2) | Level 2 | ||
| Cash and Cash Equivalents [Line Items] | ||
| Total short-term investments | 1,399 | 1,459 |
| Corporate debt securities (Level 2) | Level 2 | ||
| Cash and Cash Equivalents [Line Items] | ||
| Total short-term investments | 117 | 180 |
| Certificates of deposit (Level 2) | Level 2 | ||
| Cash and Cash Equivalents [Line Items] | ||
| Total short-term investments | 20 | 56 |
| Money market funds (Level 1) | Level 1 | ||
| Cash and Cash Equivalents [Line Items] | ||
| Total cash equivalents | 530 | 654 |
| U.S. government securities (Level 2) | Level 2 | ||
| Cash and Cash Equivalents [Line Items] | ||
| Total cash equivalents | $ 0 | $ 16 |