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Borrowings (Schedule of Future Principal Payments for Long-Term Debt) (Details) - USD ($)
$ in Millions
Jan. 27, 2018
Jul. 29, 2017
Debt Disclosure [Abstract]    
2018 (remaining six months) $ 4,750  
2019 5,250  
2020 6,000  
2021 3,000  
2022 2,500  
Thereafter 9,000  
Total $ 30,500 $ 30,500