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Shareholders' Equity (Additional Information) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended
	Jan. 24, 2015	Jan. 25, 2014	Jan. 24, 2015	Jan. 25, 2014	Apr. 25, 2015	Jul. 26, 2014
Class of Stock [Line Items]
Cash dividends paid per common share (in dollars per share)	$ 0.19	$ 0.17	$ 0.38	$ 0.34
Cash dividends declared, per common share			$ 0.38	$ 0.34
Payments of Dividends			$ 1,947,000,000us-gaap_PaymentsOfDividends	$ 1,810,000,000us-gaap_PaymentsOfDividends
Authorized common stock repurchase amount	97,000,000,000		97,000,000,000
Remaining authorized repurchase amount	6,300,000,000		6,300,000,000
Shares Paid for Tax Withholding for Share Based Compensation (shares in million)	15	13
Payments Related to Tax Withholding for Share-based Compensation	369,000,000	309,000,000	369,000,000	309,000,000
Stock repurchase program
Class of Stock [Line Items]
Accrued Liabilities, Current	$ 150,000,000		$ 150,000,000			$ 126,000,000
Subsequent Event [Member]
Class of Stock [Line Items]
Dividends Payable, Date Declared					Feb. 11, 2015
Cash dividends declared, per common share					$ 0.21
Dividends Payable, Date of Record					Apr. 02, 2015
Dividends Payable, Date to be Paid					Apr. 22, 2015