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Investments - Summary of Marketable Securities (Details) - USD ($) $ in Millions | Oct. 31, 2024 | Jan. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 5,978 | $ 6,553
Unrealized Gains | 19 | 15
Unrealized Losses | (3) | (8)
Aggregate Fair Value | 5,994 | 6,560
Included in Cash and cash equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 148 | 759
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Aggregate Fair Value | 148 | 759
Included in Marketable securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,830 | 5,794
Unrealized Gains | 19 | 15
Unrealized Losses | (3) | (8)
Aggregate Fair Value | 5,846 | 5,801
U.S. treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,660 | 2,072
Unrealized Gains | 5 | 4
Unrealized Losses | (1) | (2)
Aggregate Fair Value | 1,664 | 2,074
U.S. agency obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 694 | 753
Unrealized Gains | 2 | 2
Unrealized Losses | 0 | (1)
Aggregate Fair Value | 696 | 754
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,058 | 2,496
Unrealized Gains | 12 | 9
Unrealized Losses | (2) | (5)
Aggregate Fair Value | 3,068 | 2,500
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 566 | 1,232
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Aggregate Fair Value | $ 566 | $ 1,232

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