Cash, Cash Equivalents and Investments - Summary of Contractual Maturity (Details) $ in Millions	Apr. 26, 2020 USD ($)
Contractual maturities of investments
Due in one year or less, Cost	$ 378
Due after one through five years, Cost	958
No single maturity date, Cost	709
Cost of short-term and long-term investments	2,045
Due in one year or less, Estimated Fair Value	380
Due after one through five years, Estimated Fair Value	969
No single maturity date, Estimated Fair Value	752
Estimated fair value of short-term and long-term investments	$ 2,101