Shareholders' Equity (Additional Information) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jul. 25, 2015	Jul. 26, 2014	Jul. 27, 2013
Class of Stock [Line Items]
Cash dividends paid per common share (in dollars per share)	$ 0.80	$ 0.72	$ 0.62
Payments of Dividends	$ 4,086	$ 3,758	$ 3,310
Authorized common stock repurchase amount	97,000
Remaining authorized repurchase amount	4,300
Accrued Liabilities, Current	$ 36	$ 126
Shares Paid for Tax Withholding for Share Based Compensation (in shares)	20	18
Payments Related to Tax Withholding for Share-based Compensation	$ 502	$ 430	$ 330