Shareholders' Equity - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Apr. 26, 2014	Jan. 25, 2014	Jan. 26, 2013	Jan. 25, 2014	Jan. 26, 2013	Jan. 25, 2014 Stock Repurchase Program	Jul. 27, 2013 Stock Repurchase Program
Shareholders Equity [Line Items]
Accrued Liabilities, Current						$ 340,000,000	$ 0
Cash dividends declared per common share (in dollars per share)	$ 0.19	$ 0.17	$ 0.14	$ 0.34	$ 0.28
Dividends Payable, Date to be Paid	Apr. 23, 2014
Dividends Payable, Date of Record	Apr. 03, 2014
Payments of Dividends				1,810,000,000	1,487,000,000
Dividends Payable, Date Declared	Feb. 12, 2014
Stock Repurchase Program, Authorized Amount		97,000,000,000		97,000,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount				12,100,000,000
Shares Withheld for Employee Tax Withholding Upon Vesting of RSU (in shares)				13	11
Payments Related to Tax Withholding for Share-based Compensation				$ 309,000,000	$ 212,000,000