Shareholders' Equity (Additional Information) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	12 Months Ended			3 Months Ended
	Jul. 26, 2014	Jul. 27, 2013	Jul. 28, 2012	Oct. 25, 2014 Subsequent Event
Class of Stock [Line Items]
Cash dividends paid per common share (in dollars per share)	$ 0.72	$ 0.62	$ 0.28	$ 0.19
Payments of Dividends	$ 3,758,000,000	$ 3,310,000,000	$ 1,501,000,000
Dividends Payable, Date Declared				Aug. 26, 2014
Dividends Payable, Date of Record				Oct. 02, 2014
Dividends Payable, Date to be Paid				Oct. 22, 2014
Authorized common stock repurchase amount	97,000,000,000
Remaining authorized repurchase amount	8,600,000,000
Accrued Liabilities, Current	126,000,000	0
Shares Paid for Tax Withholding for Share Based Compensation (in shares)	18	16
Payments Related to Tax Withholding for Share-based Compensation	$ 430,000,000	$ 330,000,000	$ 200,000,000