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Debt - Future Principal Payments (Details)
$ in Millions
Jul. 31, 2020
USD ($)
Debt Disclosure [Abstract]  
Remaining six months of fiscal 2021 $ 2
Fiscal 2022 4
Fiscal 2023 4
Fiscal 2024 1,182
Fiscal 2025 0
Thereafter 1,500
Total principal outstanding $ 2,692