Cash Equivalents and Investments - Schedule of Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Millions	Jan. 31, 2025	Jan. 31, 2024
Cash and Cash Equivalents [Line Items]
Estimated fair value	$ 2,362	$ 2,019
Cash and cash equivalents
Cash and Cash Equivalents [Line Items]
Estimated fair value	248	151
Cash and cash equivalents | Money market funds
Cash and Cash Equivalents [Line Items]
Estimated fair value	225	151
Cash and cash equivalents | Certificates of Deposit
Cash and Cash Equivalents [Line Items]
Estimated fair value	23	0
Short-term investments (Available-for-sale)
Cash and Cash Equivalents [Line Items]
Estimated fair value	2,114	1,868
Short-term investments (Available-for-sale) | U.S. treasury securities
Cash and Cash Equivalents [Line Items]
Estimated fair value	1,788	1,784
Short-term investments (Available-for-sale) | Corporate debt securities
Cash and Cash Equivalents [Line Items]
Estimated fair value	281	43
Short-term investments (Available-for-sale) | Certificates of Deposit
Cash and Cash Equivalents [Line Items]
Estimated fair value	$ 45	$ 41