v2.4.0.8

Employee Stock Plans (Summary Of Significant Ranges Of Outstanding And Exercisable Stock Options) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Oct. 26, 2013 | Jul. 27, 2013 | Jul. 28, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options outstanding | 249 | 276 | 520
Stock options outstanding, weighted-average remaining contractual life | 2 years 4 months 2 days |  |
Stock options outstanding, weighted-average exercise price per share | $ 24.62 | $ 24.44 | $ 22.68
Stock options outstanding, aggregate intrinsic value | $ 418 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 244 | 271 |
Stock options exercisable, weighted-average exercise price per share | $ 25.08 | $ 24.84 |
Stock options exercisable, aggregate intrinsic value | 316 |  |
$0.01 - 15.00 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options outstanding | 11 |  |
Stock options outstanding, weighted-average remaining contractual life | 5 years 6 months 14 days |  |
Stock options outstanding, weighted-average exercise price per share | $ 4.66 |  |
Stock options outstanding, aggregate intrinsic value | 198 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 6 |  |
Stock options exercisable, weighted-average exercise price per share | $ 6.25 |  |
Stock options exercisable, aggregate intrinsic value | 96 |  |
Range of exercise price of stock options outstanding and exercisable, minimum | $ 0.01 |  |
Range of exercise price of stock options outstanding and exercisable, maximum | $ 15.00 |  |
$15.01 - 18.00 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options outstanding | 35 |  |
Stock options outstanding, weighted-average remaining contractual life | 11 months 16 days |  |
Stock options outstanding, weighted-average exercise price per share | $ 17.79 |  |
Stock options outstanding, aggregate intrinsic value | 165 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 35 |  |
Stock options exercisable, weighted-average exercise price per share | $ 17.79 |  |
Stock options exercisable, aggregate intrinsic value | 165 |  |
Range of exercise price of stock options outstanding and exercisable, minimum | $ 15.01 |  |
Range of exercise price of stock options outstanding and exercisable, maximum | $ 18.00 |  |
$18.01 - 20.00 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options outstanding | 13 |  |
Stock options outstanding, weighted-average remaining contractual life | 9 months 22 days |  |
Stock options outstanding, weighted-average exercise price per share | $ 19.13 |  |
Stock options outstanding, aggregate intrinsic value | 43 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 13 |  |
Stock options exercisable, weighted-average exercise price per share | $ 19.13 |  |
Stock options exercisable, aggregate intrinsic value | 43 |  |
Range of exercise price of stock options outstanding and exercisable, minimum | $ 18.01 |  |
Range of exercise price of stock options outstanding and exercisable, maximum | $ 20.00 |  |
$20.01 - 25.00 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options outstanding | 79 |  |
Stock options outstanding, weighted-average remaining contractual life | 1 year 11 months 26 days |  |
Stock options outstanding, weighted-average exercise price per share | $ 22.83 |  |
Stock options outstanding, aggregate intrinsic value | 12 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 79 |  |
Stock options exercisable, weighted-average exercise price per share | $ 22.83 |  |
Stock options exercisable, aggregate intrinsic value | 12 |  |
Range of exercise price of stock options outstanding and exercisable, minimum | $ 20.01 |  |
Range of exercise price of stock options outstanding and exercisable, maximum | $ 25.00 |  |
$25.01 - 35.00 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options outstanding | 111 |  |
Stock options outstanding, weighted-average remaining contractual life | 2 years 10 months 13 days |  |
Stock options outstanding, weighted-average exercise price per share | $ 30.69 |  |
Stock options outstanding, aggregate intrinsic value | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 111 |  |
Stock options exercisable, weighted-average exercise price per share | $ 30.69 |  |
Stock options exercisable, aggregate intrinsic value | $ 0 |  |
Range of exercise price of stock options outstanding and exercisable, minimum | $ 25.01 |  |
Range of exercise price of stock options outstanding and exercisable, maximum | $ 35.00 |  |

X
- Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration