Fair Value Measurements (Details) (USD $) In Millions	3 Months Ended
	Jul. 29, 2011	Jul. 30, 2010	Apr. 29, 2011
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Line Items]
Beginning Balance	$ 191	$ 213
Total realized losses and other-than-temporary impairment losses included in earnings	(1)	(2)
Total unrealized gains/(losses) included in other comprehensive income	2	(2)
Net purchases, issuances and settlements	(2)	(11)
Ending Balance	190	198
Fair Value Measurements [Abstract]
Debt Instrument Fair Value	8,635		8,524
Debt Instrument Carrying Amount	8,093		8,096
Fair Value Equity Other Investments	843		656
Equity Method Investment Other Than Temporary Impairment		(3)
Other intangible assets, net	2,695		2,777
Carrying amount of Goodwill	9,541		9,537
Estimate of Fair Value [Member]
Fair Value Measurements [Line Items]
Corporate Debt Securities Available-for-sale, Fair Value Disclosure	2,390		1,961
Auction Rate Securities Available-for-sale, Fair Value Disclosure	134		133
Mortgage Backed Securities Available For Sale Fair Value Disclosure	857		785
US Government And Agency Securities	2,695		2,756
Foreign Government and Agency Securities Available For Sale, Fair Value Disclosure	89		131
Certificates of Deposit Available-for-sale, Fair Value Disclosure	109		119
Other Asset Backed Securities Available-for-sale, Fair Value Disclosure	400		349
Marketable Equity Securities Available-for-sale, Fair Value Disclosure	225		237
Derivative Financial Instruments Assets Fair Value Disclosure	175		130
Exchange-traded Funds Trading, Fair Value Disclosure	41		39
Total Assets, Fair Value Disclosure	7,115		6,640
Derivative Financial Instruments Liabilities Fair Value Disclosure	296		303
Total Liabilities, Fair Value Disclosure	296		303
Level 1 [Member]
Fair Value Measurements [Line Items]
US Government And Agency Securities	1,398		1,453
Marketable Equity Securities Available-for-sale, Fair Value Disclosure	225		237
Derivative Financial Instruments Assets Fair Value Disclosure	33		21
Exchange-traded Funds Trading, Fair Value Disclosure	41		39
Total Assets, Fair Value Disclosure	1,697		1,750
Derivative Financial Instruments Liabilities Fair Value Disclosure	296		303
Total Liabilities, Fair Value Disclosure	296		303
Level 2 [Member]
Fair Value Measurements [Line Items]
Corporate Debt Securities Available-for-sale, Fair Value Disclosure	2,373		1,944
Mortgage Backed Securities Available For Sale Fair Value Disclosure	824		750
US Government And Agency Securities	1,297		1,303
Foreign Government and Agency Securities Available For Sale, Fair Value Disclosure	89		131
Certificates of Deposit Available-for-sale, Fair Value Disclosure	109		119
Other Asset Backed Securities Available-for-sale, Fair Value Disclosure	394		343
Derivative Financial Instruments Assets Fair Value Disclosure	142		109
Total Assets, Fair Value Disclosure	5,228		4,699
Level 3 [Member]
Fair Value Measurements [Line Items]
Corporate Debt Securities Available-for-sale, Fair Value Disclosure	17		17
Auction Rate Securities Available-for-sale, Fair Value Disclosure	134		133
Mortgage Backed Securities Available For Sale Fair Value Disclosure	33		35
Other Asset Backed Securities Available-for-sale, Fair Value Disclosure	6		6
Total Assets, Fair Value Disclosure	190		191
Corporate Debt Securities [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Line Items]
Beginning Balance	17	16
Total realized losses and other-than-temporary impairment losses included in earnings		(1)
Total unrealized gains/(losses) included in other comprehensive income		2
Net purchases, issuances and settlements		(1)
Ending Balance	17	16
Auction Rate Securities [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Line Items]
Beginning Balance	133	142
Total realized losses and other-than-temporary impairment losses included in earnings
Total unrealized gains/(losses) included in other comprehensive income	1	(4)
Net purchases, issuances and settlements
Ending Balance	134	138
Mortgage Backed Securities [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Line Items]
Beginning Balance	35	39
Total realized losses and other-than-temporary impairment losses included in earnings		(1)
Total unrealized gains/(losses) included in other comprehensive income
Net purchases, issuances and settlements	(2)	(1)
Ending Balance	33	37
Asset Backed Securities [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Line Items]
Beginning Balance	6	16
Total realized losses and other-than-temporary impairment losses included in earnings	(1)
Total unrealized gains/(losses) included in other comprehensive income	1
Net purchases, issuances and settlements		(9)
Ending Balance	$ 6	$ 7