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	6,124			6,124		6,124
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Net of Tax	(328)				(316)	(316)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest							(12)
Stock Issued During Period, Shares, New Issues		110
Stock Issued During Period, Value, New Issues	1,115		1,115			1,115
Repurchased Shares And Retired During Period Shares		(152)
Stock Repurchased During Period, Value	(2,560)		(1,097)	(1,463)		(2,560)
Shares Repurchased In Settlement Of Employee Tax Withholding Obligations Shares		(10)
Stock Repurchased for tax withholdings on vesting of restricted stock units, value	(160)		(160)			(160)
Cash dividends declared	(1,076)			(1,076)		(1,076)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	(36)		(36)			(36)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	1,032		1,032			1,032
Stock Issued During Period, Value, Acquisitions	8		8			8
Stockholders' Equity Attributable to Noncontrolling Interest at Apr. 28, 2012							21
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Apr. 28, 2012	51,378
Shares, Issued at Apr. 28, 2012		5,383
Stockholders' Equity Excluding Portion Attributable to Noncontrolling Interest at Apr. 28, 2012			39,510	10,869	978	51,357
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	7,713			7,713		7,713
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Net of Tax	23				28	28
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest							(5)
Stock Issued During Period, Shares, New Issues		111
Stock Issued During Period, Value, New Issues	1,193		1,193			1,193
Repurchased Shares And Retired During Period Shares		(81)
Stock Repurchased During Period, Value	(1,613)		(606)	(1,007)		(1,613)
Shares Repurchased In Settlement Of Employee Tax Withholding Obligations Shares		(13)
Stock Repurchased for tax withholdings on vesting of restricted stock units, value	(249)		(249)			(249)
Cash dividends declared	(2,392)			(2,392)		(2,392)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	(120)		(120)			(120)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	880		880			880
Stock Issued During Period, Value, Acquisitions	62		62			62
Stockholders' Equity Attributable to Noncontrolling Interest at Apr. 27, 2013	10						10
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Apr. 27, 2013	56,798
Shares, Issued at Apr. 27, 2013		5,315
Stockholders' Equity Excluding Portion Attributable to Noncontrolling Interest at Apr. 27, 2013			$ 40,431	$ 15,668	$ 689	$ 56,788