Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Millions	Jan. 31, 2016	Oct. 25, 2015
Contractual maturities of investments
Due in one year or less, Cost	$ 135
Due after one through five years, Cost	631
No single maturity date, Cost	365
Short-term and long-term investments, Cost	1,131	$ 1,095
Due in one year or less, Estimated Fair Value	135
Due after one through five years, Estimated Fair Value	632
No single maturity date, Estimated Fair Value	383
Investments maturities, Estimated Fair Value	$ 1,150	$ 1,114