Shareholders' Equity (Additional Information) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Jan. 23, 2016	Oct. 24, 2015	Oct. 25, 2014	Jul. 25, 2015
Class of Stock [Line Items]
Cash dividends paid per common share (in dollars per share)		$ 0.21	$ 0.19
Cash dividends declared (In dollars per share)		$ 0.21	$ 0.19
Payments of Dividends		$ 1,068	$ 973
Authorized common stock repurchase amount		97,000
Remaining authorized repurchase amount		$ 3,100
Shares Paid for Tax Withholding for Share Based Compensation (shares in million)		15	14
Payments Related to Tax Withholding for Share-based Compensation		$ 382	$ 342
Stock repurchase program
Class of Stock [Line Items]
Accrued Liabilities, Current		$ 33		$ 36
Subsequent Event [Member]
Class of Stock [Line Items]
Cash dividends paid per common share (in dollars per share)	$ 0.21
Dividends Payable, Date Declared	Nov. 18, 2015
Dividends Payable, Date to be Paid	Jan. 20, 2016
Dividends Payable, Date of Record	Jan. 06, 2016