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Income Tax (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Apr. 30, 2022 | Apr. 30, 2021
Tax Credit Carryforward [Line Items] |  |
Provision for income taxes | $ 49 | $ (25)
(Loss) income before income taxes | 195 | $ 131
Unrecognized tax benefits | 212 |
Unrecognized tax benefits that would reduce the valuation allowance if recognized | 34 |
Effect of change in unrecognized tax benefits | 7 |
SEC Schedule, 12-09, Valuation Allowance, Tax Credit Carryforward |  |
Tax Credit Carryforward [Line Items] |  |
Amount of gross unrecognized tax benefits that would impact the effective tax rate, if recognized | $ 178 |

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