Investments (Details) (USD $) In Millions	3 Months Ended	12 Months Ended
Jul. 29, 2011	Jul. 30, 2010	Apr. 29, 2011
Available For Sale Securities Debt Maturities Fair Value [Abstract]
Available For Sale Securities Debt Maturities Within One Year Fair Value	$ 1,367
Available For Sale Securities Debt Maturities After One Through Five Years Fair Value	4,545
Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value	612
Available For Sale Securities Debt Maturities After Ten Years Fair Value	150
Available For Sale Securities Debt Maturities Fair Value	6,674
Investments [Abstract]
Cost method, equity method and other investments	843		656
Cost method, equity method and other investments Fair Value	843		656
Impairment Of Investments	1	9
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities	1	6
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	1	3
Line Item For Gain Loss Recognized on Debt Instrument on Income Statement	interest expense, net
Line Item For Gain Loss Recognized on Equity Instrument on Income Statement	other expense
Line Item For Unrealized Gain Loss On Debt Instrument	accumulated other comprehensive loss
Line Item For Unrealized Gain Loss On Trading Securities	interest expense, net
Equity Method Investment Other Than Temporary Impairment		(3)
Equity Method Investment Realized Gain Loss On Disposal	5
Equity Method Investment Net Sales Proceeds
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning Balance	20	17	17
Ending Balance	20	19	20
Credit losses recognized on securities previously not impaired	1	1
Additional credit losses recognized on securities previously impaired		2
Reductions for securities sold	(1)	(1)
Schedule Of Available For Sale Securities Unrealized Losses [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	759		850
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses	(69)		(8)
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	230		228
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses	(47)		(48)
Short Term And Long Term Investments [Line Items]
Short-term investments	1,128		1,046
Total Long Term AFS and Trading Investments	5,812		5,464
Corporate Debt Securities [Member]
Schedule Of Available For Sale Securities Unrealized Losses [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	348		256
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses	(1)		(1)
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	16		16
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses	(5)		(5)
Corporate Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	2,367		1,947
Available For Sale Securities Gross Unrealized Gains	29		20
Available For Sale Securities Gross Unrealized Loss	(6)		(6)
Available For Sale Securities	2,390		1,961
Auction Rate Securities [Member]
Schedule Of Available For Sale Securities Unrealized Losses [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	134		133
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses	(33)		(34)
Auction Rate Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	167		167
Available For Sale Securities Gross Unrealized Loss	(33)		(34)
Available For Sale Securities	134		133
Mortgage Backed Securities [Member]
Schedule Of Available For Sale Securities Unrealized Losses [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	221		161
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses	(1)
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	70		67
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses	(7)		(7)
Mortgage Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	854		783
Available For Sale Securities Gross Unrealized Gains	11		10
Available For Sale Securities Gross Unrealized Loss	(8)		(8)
Available For Sale Securities	857		785
US Government Agencies Debt Securities [Member]
Schedule Of Available For Sale Securities Unrealized Losses [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value			267
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses			(1)
US Government Agencies Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	2,652		2,731
Available For Sale Securities Gross Unrealized Gains	43		26
Available For Sale Securities Gross Unrealized Loss			(1)
Available For Sale Securities	2,695		2,756
Foreign Government Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	88		130
Available For Sale Securities Gross Unrealized Gains	1		1
Available For Sale Securities	89		131
Certificates Of Deposit [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	109		119
Available For Sale Securities	109		119
Asset Backed Securities [Member]
Schedule Of Available For Sale Securities Unrealized Losses [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	10
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses	(2)
Asset Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	400		351
Available For Sale Securities Gross Unrealized Gains	2		1
Available For Sale Securities Gross Unrealized Loss	(2)		(3)
Available For Sale Securities	400		349
Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	284		186
Available For Sale Securities Gross Unrealized Gains	8
Available For Sale Securities Gross Unrealized Loss	(67)
Available For Sale Securities	225		237
Total Short Term And Long Term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	7,806		7,103
Available For Sale Securities Gross Unrealized Gains	94		119
Available For Sale Securities Gross Unrealized Loss	(117)		(56)
Available For Sale Securities	7,783		7,166
Marketable Equity Securities [Member]
Schedule Of Available For Sale Securities Unrealized Losses [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	190
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses	(67)
Debt Securities [Member]
Short Term and Long Term Activity [Line Items]
Available For Sale Securities Gross Realized Gains Losses Sale Proceeds	1,561	1,183
Available For Sale Securities Gross Realized Gains	10	7
Available For Sale Securities Gross Realized Losses	(2)	(4)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Period Increase (Decrease), Total	(1)	(3)
Exchange Traded Funds [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Fair Value	41		39
Unrealized Gains			6
Unrealized Losses	(1)
Cost	42		33
Available For Sale Securities [Member]
Short Term And Long Term Investments [Line Items]
Short-term investments	1,128		1,046
Long-term investments	5,771		5,425
Trading Securities [Member]
Short Term And Long Term Investments [Line Items]
Long-term investments	$ 41		$ 39

Carrying Value of Trading Securities

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Total long-term available-for-sale securities

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Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature within one year from the balance sheet date or the normal operating cycle, whichever is longer. Such securities are reported at fair value; unrealized gains and losses of such securities are excluded from earnings and included in other comprehensive income, a separate component of shareholders' equity, unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis.

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This item represents the gross unrealized gains for securities which are categorized neither as held-to-maturity nor trading securities. Such gross unrealized gains are the excess of the fair value of the Available-for-sale Securities over their carrying value as of the reporting date. Such gross unrealized gains are included in other comprehensive income in the statement of shareholders' equity, unless the Available-for-sale Security is designated as a hedge. All or a portion of the unrealized holding gain of an available-for-sale security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge.

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This item represents the gross unrealized losses for securities which are categorized neither as held-to-maturity nor trading securities. Such gross unrealized losses are the excess of the carrying value of the Available-for-sale Securities over their fair value as of the reporting date. Such gross unrealized losses are included in other comprehensive income in the statement of shareholders' equity, unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis.

+ References

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This item represents the amount of net sales proceeds received on disposal of an equity method investment.

+ Details

Name:	us-gaap_EquityMethodInvestmentNetSalesProceeds
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 19
-Subparagraph h

+ Details

Name:	us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This item represents the amount of gain or loss arising from the disposal of an equity method investment.

+ Details

Name:	us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the amount by which the carrying amount exceeds the fair value of the investment. The amount is charged to income if the decline in fair value is deemed to be other than temporary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 16

+ Details

Name:	us-gaap_ImpairmentOfInvestments
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_InvestmentsAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

Name:	us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

Name:	us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition; this is the reason why the trading category of investments in debt and equity securities are bought and sold "principally" for sale in the near term. Transfers into and out of the trading category should be rare. Such financial instruments that are held as of the reporting date are measured at fair value with unrealized holding gains and losses (the difference between fair value and the previously reported carrying amount) included in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 29

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Implementation Guide (Q and A)
-Number FAS115
-Paragraph 35

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph a

+ Details

Name:	us-gaap_TradingSecurities
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

For trading securities held as of the balance sheet date, this amount represents the excess fair value of trading securities over their carrying value (unrealized holding gain). Trading securities are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) and such unrealized holding gain is included in earnings for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph a

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 21
-Subparagraph e

+ Details

Name:	us-gaap_TradingSecuritiesUnrealizedHoldingGain
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

For trading securities held as of the balance sheet date, this amount represents the excess carrying value of trading securities over their fair value (unrealized holding loss). Trading securities are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) and such unrealized holding loss is included in earnings for the period.

+ References

+ Details

Name:	us-gaap_TradingSecuritiesUnrealizedHoldingLoss
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration