Cash, Cash Equivalents and Investments (Details 1) (USD $) In Millions, unless otherwise specified	Apr. 29, 2012
Contractual maturities of investments
Due in one year or less, Cost	$ 365
Due in one year or less, Estimated Fair value	365
Due after one through five years, Cost	667
Due after one through five years, Estimated Fair Value	672
Due after five years, Cost	1
Due after five years, Estimated Fair Value	2
No single maturity date, Cost	415	[1]
No single maturity date, Estimated Fair Value	441	[1]
Investments maturities amortized cost	1,448
Investments maturities fair value	$ 1,480

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