Shareholders' Equity (Additional Information) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Jul. 30, 2016	Jul. 25, 2015	Jul. 26, 2014
Class of Stock [Line Items]
Cash dividends paid per common share (in dollars per share)	$ 0.94	$ 0.80	$ 0.72
Payments of Dividends	$ 4,750	$ 4,086	$ 3,758
Authorized common stock repurchase amount	112,000
Remaining authorized repurchase amount	$ 15,400
Shares Paid for Tax Withholding for Share Based Compensation (in shares)	21	20
Payments Related to Tax Withholding for Share-based Compensation	$ 557	$ 502	$ 430
Stock repurchase program [Member]
Class of Stock [Line Items]
Stock repurchase, pending settlement	$ 45	$ 36

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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.

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Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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