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Borrowings (Schedule of Future Principal Payments for Long-Term Debt) (Details) - USD ($)
$ in Millions
Jan. 26, 2019
Jul. 28, 2018
Debt Disclosure [Abstract]    
2019 (remaining six months) $ 5,250  
2020 6,000  
2021 3,000  
2022 2,500  
2023 500  
Thereafter 8,500  
Total $ 25,750 $ 25,750