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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