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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended
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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 |  |

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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