Consolidated Statements Of Equity (USD $) In Millions, unless otherwise specified	Total USD ($)	Common Stock	Common Stock Including Additional Paid in Capital [Member] USD ($)	Retained Earnings [Member] USD ($)	Accumulated Other Comprehensive Income (Loss) [Member] USD ($)	Parent USD ($)	Noncontrolling Interest [Member] USD ($)
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 28, 2012							$ 15
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jul. 28, 2012	51,301
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	5,235			5,235		5,235
Other Comprehensive Income (Loss), Net of Tax	232				237	237	(5)
Stock Issued During Period, (In shares)		76
Stock Issued During Period, Value, New Issues	652		652			652
Repurchased Shares During Period ( In shares)		(40)
Stock Repurchased During Period, Value	(753)		(298)	(455)		(753)
Shares Repurchased In Settlement Of Employee Tax Withholding Obligations ( In shares)	(11)	(11)
Adjustments Related to Tax Withholding for Share-based Compensation	(212)		(212)			(212)
Cash dividends declared	(1,487)			(1,487)		(1,487)
Tax effects from employee stock incentive plans	(97)		(97)			(97)
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
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jan. 26, 2013	55,525
Stockholders' Equity Attributable to Parent at Jan. 26, 2013			39,970	14,647	898	55,515
Shares, Issued at Jan. 26, 2013		5,323
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 27, 2013	8						8
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jul. 27, 2013	59,128
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	3,425			3,425		3,425
Other Comprehensive Income (Loss), Net of Tax	102				95	95	7
Stock Issued During Period, (In shares)		84
Stock Issued During Period, Value, New Issues	837		837			837
Repurchased Shares During Period ( In shares)	(269)	(269)
Stock Repurchased During Period, Value	(6,020)		(2,118)	(3,902)		(6,020)
Shares Repurchased In Settlement Of Employee Tax Withholding Obligations ( In shares)	(13)	(13)
Adjustments Related to Tax Withholding for Share-based Compensation	(309)		(309)			(309)
Cash dividends declared	(1,810)			(1,810)		(1,810)
Tax effects from employee stock incentive plans	29		29			29
Share-based Compensation, Requisite Service Period Recognition	656		656			656
Stock Issued During Period, Value, Acquisitions	46		46			46
Stockholders' Equity Attributable to Noncontrolling Interest at Jan. 25, 2014	15						15
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jan. 25, 2014	56,084
Stockholders' Equity Attributable to Parent at Jan. 25, 2014	$ 56,069		$ 41,438	$ 13,928	$ 703	$ 56,069
Shares, Issued at Jan. 25, 2014		5,191