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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.

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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)

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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.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Employee Benefit Plans (Summary Of Significant Ranges Of Outstanding And Exercisable Stock Options) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended
	Jan. 24, 2015	Jul. 26, 2014	Jul. 27, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding (in shares)	133	187	276
Weighted- Average Remaining Contractual Life (in Year/Month/Date))	1 year 6 months
Weighted- Average Exercise Price per Share	$ 27.45	$ 26.03	$ 24.44
Aggregate Intrinsic Value	$ 377
Number Exercisable, shares	131	183
Weighted- Average Exercise Price per Share	$ 27.94	$ 26.50
Aggregate Intrinsic Value	311
$ 0.01 – 15.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding (in shares)	5
Weighted- Average Remaining Contractual Life (in Year/Month/Date))	5 years 4 months 24 days
Weighted- Average Exercise Price per Share	$ 4.17
Aggregate Intrinsic Value	135
Number Exercisable, shares	3
Weighted- Average Exercise Price per Share	$ 5.66
Aggregate Intrinsic Value	69
15.01 – 18.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding (in shares)	1
Weighted- Average Remaining Contractual Life (in Year/Month/Date))	2 years
Weighted- Average Exercise Price per Share	$ 16.91
Aggregate Intrinsic Value	3
Number Exercisable, shares	1
Weighted- Average Exercise Price per Share	$ 16.91
Aggregate Intrinsic Value	3
18.01 – 20.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding (in shares)	1
Weighted- Average Remaining Contractual Life (in Year/Month/Date))	0 years 3 months 18 days
Weighted- Average Exercise Price per Share	$ 19.69
Aggregate Intrinsic Value	9
Number Exercisable, shares	1
Weighted- Average Exercise Price per Share	$ 19.69
Aggregate Intrinsic Value	9
20.01 – 25.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding (in shares)	37
Weighted- Average Remaining Contractual Life (in Year/Month/Date))	0 years 9 months 18 days
Weighted- Average Exercise Price per Share	$ 22.90
Aggregate Intrinsic Value	198
Number Exercisable, shares	37
Weighted- Average Exercise Price per Share	$ 22.90
Aggregate Intrinsic Value	198
25.01 – 30.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding (in shares)	20
Weighted- Average Remaining Contractual Life (in Year/Month/Date))	1 year 6 months
Weighted- Average Exercise Price per Share	$ 26.72
Aggregate Intrinsic Value	32
Number Exercisable, shares	20
Weighted- Average Exercise Price per Share	$ 26.72
Aggregate Intrinsic Value	32
30.01 – 35.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding (in shares)	69
Weighted- Average Remaining Contractual Life (in Year/Month/Date))	1 year 6 months
Weighted- Average Exercise Price per Share	$ 32.16
Aggregate Intrinsic Value	0
Number Exercisable, shares	69
Weighted- Average Exercise Price per Share	$ 32.16
Aggregate Intrinsic Value	$ 0