Cash, Cash Equivalents and Investments (Contractual Maturities) (Details) (USD $) In Millions, unless otherwise specified	Oct. 26, 2014
Cash and Cash Equivalents [Abstract]
Due in one year or less, Cost	$ 151
Due after one through five years, Cost	539
No single maturity date, Cost	372	[1]
Investments maturities amortized, Cost	1,062
Due in one year or less, Estimated Fair Value	151
Due after one through five years, Estimated Fair Value	542
No single maturity date, Estimated Fair Value	402	[1]
Investments maturities, Estimated Fair Value	$ 1,095

[1] Securities with no single maturity date include publicly-traded and privately-held equity securities, and asset-backed and mortgage-backed securities.