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 ($)	Stockholder Equity Excluding Portion Attributable To Noncontrolling Interest [Member] USD ($)	Noncontrolling Interest [Member] USD ($)
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 30, 2011							$ 33
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jul. 30, 2011	47,259
Shares, Issued at Jul. 30, 2011		5,435
Stockholders' Equity Excluding Portion Attributable to Noncontrolling Interest at Jul. 30, 2011			38,648	7,284	1,294	47,226
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	1,777			1,777		1,777
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Net of Tax	(320)				(313)	(313)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest							(7)
Stock Issued During Period, Shares, New Issues		45
Stock Issued During Period, Value, New Issues	203		203			203
Repurchased Shares And Retired During Period Shares		(100)
Stock Repurchased During Period, Value	(1,544)		(715)	(829)		(1,544)
Shares Repurchased In Settlement Of Employee Tax Withholding Obligations Shares		(9)
Stock Repurchased for tax withholdings on vesting of restricted stock units, value	(137)		(137)			(137)
Cash dividends declared	(322)			(322)		(322)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	(43)		(43)			(43)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	341		341			341
Stockholders' Equity Attributable to Noncontrolling Interest at Oct. 29, 2011							26
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Oct. 29, 2011	47,214
Shares, Issued at Oct. 29, 2011		5,371
Stockholders' Equity Excluding Portion Attributable to Noncontrolling Interest at Oct. 29, 2011			38,297	7,910	981	47,188
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 28, 2012	15						15
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jul. 28, 2012	51,301
Shares, Issued at Jul. 28, 2012		5,298
Stockholders' Equity Excluding Portion Attributable to Noncontrolling Interest at Jul. 28, 2012			39,271	11,354	661	51,286
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	2,092			2,092		2,092
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Net of Tax	172				172	172
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest
Stock Issued During Period, Shares, New Issues		39
Stock Issued During Period, Value, New Issues	117		117			117
Repurchased Shares And Retired During Period Shares		(15)
Stock Repurchased During Period, Value	(253)		(114)	(139)		(253)
Shares Repurchased In Settlement Of Employee Tax Withholding Obligations Shares		(11)
Stock Repurchased for tax withholdings on vesting of restricted stock units, value	(203)		(203)			(203)
Cash dividends declared	(744)			(744)		(744)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	(87)		(87)			(87)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	306		306			306
Stockholders' Equity Attributable to Noncontrolling Interest at Oct. 27, 2012	15						15
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Oct. 27, 2012	52,701
Shares, Issued at Oct. 27, 2012		5,311
Stockholders' Equity Excluding Portion Attributable to Noncontrolling Interest at Oct. 27, 2012			$ 39,290	$ 12,563	$ 833	$ 52,686