Cash, Cash Equivalents and Investments - Additional Information (Details) $ in Millions	Jan. 26, 2020 USD ($)
Contractual maturities of investments
Due in one year or less, Cost	$ 477
Due after one through five years, Cost	953
No single maturity date, Cost	761
Cost of short-term and long-term investments	2,191
Due in one year or less, Estimated Fair Value	478
Due after one through five years, Estimated Fair Value	964
No single maturity date, Estimated Fair Value	807
Estimated fair value of short-term and long-term investments	$ 2,249