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	3,959			3,959		3,959
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Net of Tax	(458)				(444)	(444)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest							(14)
Stock Issued During Period, Shares, New Issues		78
Stock Issued During Period, Value, New Issues	653		653			653
Repurchased Shares And Retired During Period Shares		(126)
Stock Repurchased During Period, Value	(2,010)		(901)	(1,109)		(2,010)
Shares Repurchased In Settlement Of Employee Tax Withholding Obligations Shares		(9)
Stock Repurchased for tax withholdings on vesting of restricted stock units, value	(145)		(145)			(145)
Cash dividends declared ($0.28 per common share)	(644)			(644)		(644)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	(48)		(48)			(48)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	695		695			695
Stock Issued During Period, Value, Acquisitions	4		4			4
Stockholders' Equity Attributable to Noncontrolling Interest at Jan. 28, 2012							19
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jan. 28, 2012	49,265
Shares, Issued at Jan. 28, 2012		5,378
Stockholders' Equity Excluding Portion Attributable to Noncontrolling Interest at Jan. 28, 2012			38,906	9,490	850	49,246
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	5,235			5,235		5,235
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Net of Tax	232				237	237
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest							(5)
Stock Issued During Period, Shares, New Issues		76
Stock Issued During Period, Value, New Issues	652		652			652
Repurchased Shares And Retired During Period Shares		(40)
Stock Repurchased During Period, Value	(753)		(298)	(455)		(753)
Shares Repurchased In Settlement Of Employee Tax Withholding Obligations Shares		(11)
Stock Repurchased for tax withholdings on vesting of restricted stock units, value	(212)		(212)			(212)
Cash dividends declared ($0.28 per common share)	(1,487)			(1,487)		(1,487)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	(97)		(97)			(97)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	608		608			608
Stock Issued During Period, Value, Acquisitions	46		46			46
Stockholders' Equity Attributable to Noncontrolling Interest at Jan. 26, 2013	10						10
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jan. 26, 2013	55,525
Shares, Issued at Jan. 26, 2013		5,323
Stockholders' Equity Excluding Portion Attributable to Noncontrolling Interest at Jan. 26, 2013			$ 39,970	$ 14,647	$ 898	$ 55,515