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