Cash Equivalents and Investments - Schedule of Unrealized Loss Position and Fair Value of Debt Securities (Details) $ in Millions	Jan. 31, 2023 USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Estimated fair value, less than 12 months	$ 1,217
Estimated fair value, more than 12 months	960
Estimated fair value	2,177
Unrealized losses, less than 12 months	(9)
Unrealized losses, more than 12 months	(15)
Unrealized losses	(24)
U.S. treasury securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Estimated fair value, less than 12 months	1,204
Estimated fair value, more than 12 months	846
Estimated fair value	2,050
Unrealized losses, less than 12 months	(9)
Unrealized losses, more than 12 months	(13)
Unrealized losses	(22)
Corporate debt securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Estimated fair value, less than 12 months	13
Estimated fair value, more than 12 months	114
Estimated fair value	127
Unrealized losses, less than 12 months	0
Unrealized losses, more than 12 months	(2)
Unrealized losses	$ (2)