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Investments - Summary of Marketable Securities (Details) - USD ($) $ in Millions | Jul. 31, 2025 | Jan. 31, 2025
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 7,092 | $ 6,638
Unrealized Gains | 33 | 17
Unrealized Losses | (1) | (4)
Aggregate Fair Value | 7,124 | 6,651
Included in Cash and cash equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 202 | 177
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Aggregate Fair Value | 202 | 177
Included in Marketable securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 6,890 | 6,461
Unrealized Gains | 33 | 17
Unrealized Losses | (1) | (4)
Aggregate Fair Value | 6,922 | 6,474
U.S. treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,050 | 2,069
Unrealized Gains | 6 | 4
Unrealized Losses | 0 | (1)
Aggregate Fair Value | 2,056 | 2,072
U.S. agency obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 537 | 634
Unrealized Gains | 1 | 2
Unrealized Losses | 0 | 0
Aggregate Fair Value | 538 | 636
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,943 | 3,532
Unrealized Gains | 25 | 11
Unrealized Losses | (1) | (3)
Aggregate Fair Value | 3,967 | 3,540
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 215 | 294
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Aggregate Fair Value | 215 | 294
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 305 | 104
Unrealized Gains | 1 | 0
Unrealized Losses | 0 | 0
Aggregate Fair Value | 306 | 104
Other debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 42 | 5
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Aggregate Fair Value | $ 42 | $ 5

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