Shareholders' Equity - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Jul. 27, 2013	Jul. 28, 2012	Jul. 30, 2011
Shareholders Equity [Line Items]
Cash dividends paid per common share (in dollars per share)	$ 0.62	$ 0.28	$ 0.12
Payments of Dividends	$ 3,310,000,000	$ 1,501,000,000	$ 658,000,000
Authorized common stock repurchase amount	82,000,000,000
Remaining authorized repurchase amount	3,100,000,000
Shares Paid for Tax Withholding for Share Based Compensation	16	12
Payments Related to Tax Withholding for Share-based Compensation	$ 330,000,000	$ 200,000,000	$ 183,000,000
September 3, 2013 Dividend Declared [Member]
Shareholders Equity [Line Items]
Cash dividends paid per common share (in dollars per share)	$ 0.17
Dividends Payable, Date Declared	Sep. 03, 2013
Dividends Payable, Date of Record	Oct. 03, 2013
Dividends Payable, Date to be Paid	Oct. 23, 2013