Consolidated Statements Of Equity (USD $) In Millions, unless otherwise specified	Total USD ($)	Common Stock [Member]	Common Stock Including Additional Paid in Capital [Member] USD ($)	Retained Earnings [Member] USD ($)	Accumulated Other Comprehensive Income (Loss) [Member] USD ($)	Parent [Member] USD ($)	Noncontrolling Interest [Member] USD ($)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jul. 28, 2012	$ 51,301
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 28, 2012							15
Stockholders' Equity Attributable to Parent at Jul. 28, 2012			39,271	11,354	661	51,286
Shares, Issued at Jul. 28, 2012		5,298
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,092			2,092		2,092
Other Comprehensive Income (Loss), Net of Tax	172				172	172	0
Stock Issued During Period, (In shares)		39
Stock Issued During Period, Value, New Issues	117		117			117
Repurchased Shares During Period ( In shares)		(15)
Stock Repurchased During Period, Value	(253)		(114)	(139)		(253)
Shares Repurchased In Settlement Of Employee Tax Withholding Obligations ( In shares)	(11)	(11)
Adjustments Related to Tax Withholding for Share-based Compensation	(203)		(203)			(203)
Cash dividends declared	(744)			(744)		(744)
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	(87)		(87)			(87)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	306		306			306
Stockholders' Equity Attributable to Parent at Oct. 27, 2012			39,290	12,563	833	52,686
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Oct. 27, 2012	52,701
Stockholders' Equity Attributable to Noncontrolling Interest at Oct. 27, 2012							15
Shares, Issued at Oct. 27, 2012		5,311
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jul. 27, 2013	59,128
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 27, 2013	8						8
Stockholders' Equity Attributable to Parent at Jul. 27, 2013	59,120		42,297	16,215	608	59,120
Shares, Issued at Jul. 27, 2013		5,389
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,996			1,996		1,996
Other Comprehensive Income (Loss), Net of Tax	168				164	164	4
Stock Issued During Period, (In shares)		58
Stock Issued During Period, Value, New Issues	444		444			444
Repurchased Shares During Period ( In shares)	(84)	(84)
Stock Repurchased During Period, Value	(2,000)		(662)	(1,338)		(2,000)
Shares Repurchased In Settlement Of Employee Tax Withholding Obligations ( In shares)	(12)	(12)
Adjustments Related to Tax Withholding for Share-based Compensation	(286)		(286)			(286)
Cash dividends declared	(914)			(914)		(914)
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	35		35			35
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	309		309			309
Stock Issued During Period, Value, Acquisitions	29		29			29
Stockholders' Equity Attributable to Parent at Oct. 26, 2013	58,897		42,166	15,959	772	58,897
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Oct. 26, 2013	58,909
Stockholders' Equity Attributable to Noncontrolling Interest at Oct. 26, 2013	$ 12						$ 12
Shares, Issued at Oct. 26, 2013		5,351