Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax asset, capitalized research expenditures	$ 189,000,000	$ 0
Non-deductible expenses	(5.40%)	0.00%	0.00%
Increase in valuation allowance	$ 174,000,000	$ 349,000,000
Unrecognized tax benefit, impact effective tax rate	0	0	$ 0
Accrued penalties and interest related to unrecognized tax benefits	0	$ 0	$ 0
Unrecorded tax benefit, significant change in unrecognized tax benefits is reasonably possible	0
Domestic Tax Authority
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating loss carryforwards	3,208,000,000
Domestic Tax Authority | Research Tax Credit Carryforward
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax credit carryforward	98,000,000
State and Local Jurisdiction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating loss carryforwards	2,108,000,000
State and Local Jurisdiction | Research Tax Credit Carryforward
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax credit carryforward	65,000,000
UK
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating loss carryforwards	$ 46,000,000