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Goodwill and Purchased Intangible Assets (Schedule of Estimated Future Amortization Expense of Purchased Intangible Assets) (Details)
$ in Millions
Jan. 26, 2019
USD ($)
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]  
2019 (remaining six months) $ 382
2020 726
2021 530
2022 274
2023 133
Thereafter $ 45