Cash, Cash Equivalents and Investments - Summary of Contractual Maturity (Details) $ in Millions	Jul. 26, 2020 USD ($)
Contractual maturities of investments
Due in one year or less, Cost	$ 362
Due after one through five years, Cost	864
No single maturity date, Cost	641
Cost of short-term and long-term investments	1,867
Due in one year or less, Estimated Fair Value	365
Due after one through five years, Estimated Fair Value	883
No single maturity date, Estimated Fair Value	696
Estimated fair value of short-term and long-term investments	$ 1,944