Financing Arrangements (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended			3 Months Ended	9 Months Ended		3 Months Ended		9 Months Ended												0 Months Ended		3 Months Ended	9 Months Ended		9 Months Ended
	Jan. 27, 2012	Jan. 28, 2011	Jan. 27, 2012 Interest Rate Swap Fair Value Hedging	Jan. 28, 2011 Senior Convertible Notes Due 2011	Jan. 28, 2011 Senior Convertible Notes Due 2011	Jan. 27, 2012 Senior Convertible Notes Due 2011	Jan. 27, 2012 Senior Convertible Notes Due 2013	Jan. 28, 2011 Senior Convertible Notes Due 2013	Jan. 27, 2012 Senior Convertible Notes Due 2013	Jan. 28, 2011 Senior Convertible Notes Due 2013	Apr. 29, 2011 Senior Convertible Notes Due 2013	Jan. 27, 2012 Senior Notes 2005 Due 2015	Jan. 27, 2012 Senior Notes 2009 Due 2014	Jan. 27, 2012 Senior Notes 2009 Due 2019	Jan. 27, 2012 Senior Notes 2009 Due 2039	Jan. 27, 2012 Senior Notes 2010 Due 2015	Jan. 27, 2012 Senior Notes 2010 Due 2020	Jan. 27, 2012 Senior Notes 2010 Due 2040	Jan. 27, 2012 Senior Notes 2011 Due 2016	Jan. 27, 2012 Senior Notes 2011 Due 2021	Sep. 15, 2011 Series B due 2021	Apr. 29, 2011 Series B due 2021	Jan. 27, 2012 Commercial Paper D	Jan. 27, 2012 Commercial Paper D	Apr. 29, 2011 Commercial Paper	Jan. 27, 2012 Syndicated Credit Facility 2014 Committed	Apr. 29, 2011 Syndicated Credit Facility 2014 Committed
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	41
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							(112)		(112)		(177)
Net carrying amount							2,088		2,088		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	25		9	9	27	27
Interest cost related to amortization of the discount	63	130		24	70		22	21	65	61
Description of derivative hedged item			fixed rate obligations including the Company’s $1.250 billion 3.000 percent 2010 Senior Notes due 2015, $600 million 4.750 percent 2005 Senior Notes due 2015, the Company’s $500 million 2.625 percent 2011 Senior Notes due 2016, and the Company’s $500 million 4.125 percent 2011 Senior Notes due 2021.
Conversion price (per share)																						$ 61.81
Conversion rate																					100
Line of Credit Facility
Maximum credit available																							2,250	2,250		2,250
Amount outstanding																							$ 1,675	$ 1,675	$ 1,500	$ 0	$ 0
Weighted average original maturity (in days)																							107	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 four-year term of the agreement.
Line of credit - initiation date																										2010-12-09
Line of credit - expiration date																										2014-12-09