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Borrowings - Schedule of Future Principal Payments for Long-Term Debt (Details) - USD ($)
$ in Millions
Jan. 25, 2020
Jul. 27, 2019
Debt Disclosure [Abstract]    
2020 (remaining six months) $ 1,500  
2021 3,000  
2022 2,500  
2023 500  
2024 1,750  
Thereafter 6,750  
Total $ 16,000 $ 20,500