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Goodwill and Purchased Intangible Assets - Schedule of Estimated Future Amortization Expense of Purchased Intangible Assets (Details)
$ in Millions
Jul. 31, 2021
USD ($)
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]  
2022 $ 1,037
2023 873
2024 749
2025 396
2026 55
Thereafter $ 4