Cash, Cash Equivalents and Investments (Contractual Maturities) (Details) $ in Millions	Oct. 29, 2017 USD ($)
Cash and Cash Equivalents [Abstract]
Due in one year or less, Cost	$ 2,219
Due after one through five years, Cost	640
No single maturity date, Cost	475
Investments maturities amortized, Cost	3,334
Due in one year or less, Estimated Fair Value	2,219
Due after one through five years, Estimated Fair Value	640
No single maturity date, Estimated Fair Value	550
Investments maturities, Estimated Fair Value	$ 3,409