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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2025 | Oct. 31, 2024 | Oct. 31, 2025 | Oct. 31, 2024
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Provision for income taxes | $ 7 | $ 9 | $ 13 | $ 10
Pretax income (loss) | $ 50 | $ 25 | $ 185 | $ 15
Effective income tax rate | 14.00% |  | 7.10% |
Netting |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Effective income tax rate |  | 40.40% |  | 69.60%

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