Convertible Senior Notes, Net - Schedule of Interest Expense (Details) - Senior Notes - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
2025 Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 1	$ 1	$ 1
Amortization of debt issuance costs	3	2	2
Amortization of debt discount		36	34
Interest Expense, Debt, Total	4	39	37
2026 Notes
Debt Instrument [Line Items]
Contractual interest expense	4	4	3
Amortization of debt issuance costs	3	1	1
Amortization of debt discount		46	27
Interest Expense, Debt, Total	$ 7	$ 51	$ 31