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Debt - Schedule of Interest Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2025 | Jul. 31, 2024 | Jul. 31, 2025 | Jul. 31, 2024
Debt Disclosure [Abstract] |  |  |  |
Contractual interest expense | $ 28 | $ 28 | $ 55 | $ 55
Interest cost related to amortization of debt discount and issuance costs | 1 | 1 | 2 | 2
Total interest expense | $ 29 | $ 29 | $ 57 | $ 57

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