Cash, Cash Equivalents and Investments (Contractual Maturities) (Details) - USD ($) $ in Millions	Oct. 27, 2019	Oct. 28, 2018
Cash and Cash Equivalents [Abstract]
Due in one year or less, cost	$ 419
Due after one through five years, cost	971
No single maturity date, cost	744
Cost of short-term and long-term investments	2,134	$ 2,150
Due in one year or less, estimated fair value	420
Due after one through five years, estimated fair value	981
No single maturity date, estimated fair value	791
Estimated fair value of short-term and long-term investments	$ 2,192	$ 2,158