Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($) $ in Millions	Jan. 31, 2023	Jan. 31, 2022
Assets:
Total cash equivalents	$ 133	$ 152
Total short-term investments	2,316	2,242
Total cash equivalents and short-term investments	2,449	2,394
Level 1
Assets:
Total cash equivalents	133	152
Total short-term investments	0	0
Total cash equivalents and short-term investments	133	152
Level 2
Assets:
Total cash equivalents	0	0
Total short-term investments	2,316	2,242
Total cash equivalents and short-term investments	2,316	2,242
Level 3
Assets:
Total cash equivalents	0	0
Total short-term investments	0	0
Total cash equivalents and short-term investments	0	0
U.S. treasury securities
Assets:
Total short-term investments	2,185	1,913
U.S. treasury securities | Level 1
Assets:
Total short-term investments	0	0
U.S. treasury securities | Level 2
Assets:
Total short-term investments	2,185	1,913
U.S. treasury securities | Level 3
Assets:
Total short-term investments	0	0
Corporate debt securities
Assets:
Total short-term investments	131	329
Corporate debt securities | Level 1
Assets:
Total short-term investments	0	0
Corporate debt securities | Level 2
Assets:
Total short-term investments	131	329
Corporate debt securities | Level 3
Assets:
Total short-term investments	0	0
Money market funds
Assets:
Total cash equivalents	133	152
Money market funds | Level 1
Assets:
Total cash equivalents	133	152
Money market funds | Level 2
Assets:
Total cash equivalents	0	0
Money market funds | Level 3
Assets:
Total cash equivalents	$ 0	$ 0