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Cash Equivalents and Investments - Schedule of Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Millions | Jan. 31, 2023 | Jan. 31, 2022
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | $ 2,473 | $ 2,405
Unrealized Gain | 0 | 0
Unrealized Loss | (24) | (11)
Estimated Fair Value | 2,449 | 2,394
Cash and cash equivalents |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 133 | 152
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 133 | 152
Cash and cash equivalents | Money market funds |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 133 | 152
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 133 | 152
Short-term Investments |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 2,340 | 2,253
Unrealized Gain | 0 | 0
Unrealized Loss | (24) | (11)
Estimated Fair Value | 2,316 | 2,242
Short-term Investments | U.S. treasury securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 2,207 | 1,922
Unrealized Gain | 0 | 0
Unrealized Loss | (22) | (9)
Estimated Fair Value | 2,185 | 1,913
Short-term Investments | Corporate debt securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 133 | 331
Unrealized Gain | 0 | 0
Unrealized Loss | (2) | (2)
Estimated Fair Value | $ 131 | $ 329

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