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Cash Equivalents and Investments (Tables) | 6 Months Ended
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Jul. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
Schedule of Amortized Costs, Unrealized Gains and Losses and Estimated Fair Value of Cash Equivalents and Short-term Investments | The following tables present the amortized cost, unrealized gain (loss) and estimated fair value of cash equivalents and short-term investments:
| As of July 31, 2023
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
| (dollars in millions)
Level 1: |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 223 |  |  | $ | — |  |  | $ | — |  |  | $ | 223 |
Total cash equivalents | 223 |  |  | — |  |  | — |  |  | 223 |
Level 2: |  |  |  |  |  |  |
Short-term investments (Available-for-sale): |  |  |  |  |  |  |
U.S. treasury securities | 1,730 |  |  | — |  |  | (10) |  |  | 1,720 |
Corporate debt securities | 30 |  |  | — |  |  | — |  |  | 30 |
Total short-term investments | 1,760 |  |  | — |  |  | (10) |  |  | 1,750 |
Total | $ | 1,983 |  |  | $ | — |  |  | $ | (10) |  |  | $ | 1,973 |
| As of January 31, 2023
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
| (dollars in millions)
Level 1: |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 133 |  |  | $ | — |  |  | $ | — |  |  | $ | 133 |
Total cash equivalents | 133 |  |  | — |  |  | — |  |  | 133 |
Level 2: |  |  |  |  |  |  |
Short-term investments (Available-for-sale): |  |  |  |  |  |  |
U.S. treasury securities | 2,207 |  |  | — |  |  | (22) |  |  | 2,185 |
Corporate debt securities | 133 |  |  | — |  |  | (2) |  |  | 131 |
Total short-term investments | 2,340 |  |  | — |  |  | (24) |  |  | 2,316 |
Total | $ | 2,473 |  |  | $ | — |  |  | $ | (24) |  |  | $ | 2,449 |
Schedule of Contractual Maturities of Short-term Investments | The following table presents the contractual maturities of the Company’s short-term investments:
| As of July 31, 2023 |  |
| Amortized Cost |  | Estimated Fair Value |  |  |  |
| (dollars in millions) |  |  |  |
Due within one year | $ | 1,564 |  |  | $ | 1,556 |  |  |  |  |
Due between one to five years | 196 |  |  | 194 |  |  |  |  |
Total | $ | 1,760 |  |  | $ | 1,750 |  |  |  |  |
Schedule of Unrealized Loss Position and Fair Value of Debt Securities | The following table presents the fair values and unrealized losses related to the Company’s investments in available-for-sale debt securities classified by length of time that the securities have been in a continuous unrealized loss position as of July 31, 2023:
| Less Than 12 Months |  | More Than 12 Months |  | Total
| Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
| (dollars in millions)
U.S. treasury securities | $ | 1,248 |  |  | $ | (5) |  |  | $ | 447 |  |  | $ | (5) |  |  | $ | 1,695 |  |  | $ | (10) |
Corporate debt securities | 18 |  |  | — |  |  | 12 |  |  | — |  |  | 30 |  |  | — |
Total | $ | 1,266 |  |  | $ | (5) |  |  | $ | 459 |  |  | $ | (5) |  |  | $ | 1,725 |  |  | $ | (10) |

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