Financing Arrangements (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended		12 Months Ended	3 Months Ended	6 Months Ended		3 Months Ended		6 Months Ended													12 Months Ended		6 Months Ended
	Oct. 28, 2011	Oct. 29, 2010	Apr. 29, 2011	Oct. 29, 2010 Senior Convertible Notes Due 2011 [Member]	Oct. 29, 2010 Senior Convertible Notes Due 2011 [Member]	Oct. 28, 2011 Senior Convertible Notes Due 2011 [Member]	Oct. 28, 2011 Senior Convertible Notes Due 2013 [Member]	Oct. 29, 2010 Senior Convertible Notes Due 2013 [Member]	Oct. 28, 2011 Senior Convertible Notes Due 2013 [Member]	Oct. 29, 2010 Senior Convertible Notes Due 2013 [Member]	Apr. 29, 2011 Senior Convertible Notes Due 2013 [Member]	Oct. 28, 2011 Senior Notes 2005 Due 2015 [Member]	Oct. 28, 2011 Senior Notes 2009 Due 2014 [Member]	Oct. 28, 2011 Senior Notes 2009 Due 2019 [Member]	Oct. 28, 2011 Senior Notes 2009 Due 2039 [Member]	Oct. 28, 2011 Senior Notes 2010 Due 2015 [Member]	Oct. 28, 2011 Senior Notes 2010 Due 2020 [Member]	Oct. 28, 2011 Senior Notes 2010 Due 2040 [Member]	Oct. 28, 2011 Senior Notes 2011 Due 2016 [Member]	Oct. 28, 2011 Senior Notes 2011 Due 2021 [Member]	Apr. 29, 2011 Series B due 2021 [Member]	Apr. 29, 2011 Commercial Paper [Member] D	Oct. 28, 2011 Commercial Paper [Member]	Oct. 28, 2011 Syndicated Credit Facility 2014 [Member]
Debt Instrument [Line Items]
Stated interest rate						1.50%	1.625%		1.625%			4.75%	4.50%	5.60%	6.50%	3.00%	4.45%	5.55%	2.625%	4.125%	1.25%
Warrants exercise price (per share)	$ 76.56
Common stock settled for warrants (in shares)	41
Common stock settled for warrants in future (in shares)	41
Warrants expired	31
Carrying amount of the equity component							$ 547		$ 547		$ 547
Principal amount						2,200	2,200		2,200		2,200	600	550	400	300	1,250	1,250	500	500	500	15
Unamortized discount							(134)		(134)		(177)
Net carrying amount							2,066		2,066		2,023
Effective interest rate				5.97%	5.97%		6.03%	6.03%	6.03%	6.03%
Interest cost related to contractual interest coupon				8	16		9	9	18	18
Interest cost related to amortization of the discount	42	86		23	46		21	20	43	40
Conversion price (per share)			$ 61.81
Conversion rate			1
Line of Credit Facility
Maximum credit available																							2,250	2,250
Amount outstanding																						$ 1,500	$ 1,750
Weighted average original maturity (in days)																						107
Line of credit borrowing capacity description																								The Credit Facility provides the Company with the ability to increase its capacity by an additional $500 million at any time during the life of the four-year term of the agreement.