Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Millions	Jul. 31, 2016	Oct. 25, 2015
Contractual maturities of investments
Due in one year or less, Cost	$ 422
Due after one through five years, Cost	566
No single maturity date, Cost	362
Short-term and long-term investments, Cost	1,350	$ 1,095
Due in one year or less, Estimated Fair Value	422
Due after one through five years, Estimated Fair Value	570
No single maturity date, Estimated Fair Value	406
Investments maturities, Estimated Fair Value	$ 1,398	$ 1,114