Shareholders' Equity (Additional Information) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Apr. 25, 2015	Apr. 26, 2014	Apr. 25, 2015	Apr. 26, 2014	Jul. 26, 2014
Class of Stock [Line Items]
Cash dividends paid per common share (in dollars per share)	$ 0.21	$ 0.19	$ 0.59	$ 0.53
Cash dividends declared, per common share			$ 0.59	$ 0.53
Payments of Dividends			$ 3,017,000,000us-gaap_PaymentsOfDividends	$ 2,784,000,000us-gaap_PaymentsOfDividends
Authorized common stock repurchase amount	97,000,000,000		97,000,000,000
Remaining authorized repurchase amount	5,300,000,000		5,300,000,000
Shares Paid for Tax Withholding for Share Based Compensation (shares in million)	17	14
Payments Related to Tax Withholding for Share-based Compensation	415,000,000	345,000,000	415,000,000	345,000,000
Stock repurchase program
Class of Stock [Line Items]
Accrued Liabilities, Current	$ 30,000,000		$ 30,000,000		$ 126,000,000

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).

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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

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

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-Name Regulation S-X (SX)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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

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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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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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