Consolidated Statements Of Equity (USD $) In Millions	Total USD ($)	Shares of Common Stock	Common Stock and Additional Paid-In Capital USD ($)	Retained Earnings USD ($)	Accumulated Other Comprehensive Income (Loss) USD ($)	Parent [Member] USD ($)	Noncontrolling Interest USD ($)
Beginning balance at Jul. 31, 2010	$ 44,285		$ 37,793	$ 5,851	$ 623	$ 44,267	$ 18
Beginning balance (in shares) at Jul. 31, 2010		5,655
Net income	6,490			6,490		6,490
Other comprehensive (loss) income	686				671	671	15
Issuance of common stock (in shares)		141
Issuance of common stock	1,831		1,831			1,831
Repurchase of Common Stock During Period, (in shares)		(351)
Repurchase of common stock	(6,791)		(2,392)	(4,399)		(6,791)
Shares Paid for Tax Withholding for Share Based Compensation ( in shares)		(10)
Payments Related to Tax Withholding for Share-based Compensation	(183)		(183)			(183)
Cash dividends declared per common share	(658)			(658)		(658)
Tax effects from employee stock incentive plans	(33)		(33)			(33)
Share-based compensation expense	1,620		1,620			1,620
Purchase acquisitions	12		12			12
Ending Balance at Jul. 30, 2011	47,259		38,648	7,284	1,294	47,226	33
Ending Balance (in shares) at Jul. 30, 2011		5,435
Net income	8,041			8,041		8,041
Other comprehensive (loss) income	(651)				(633)	(633)	(18)
Issuance of common stock (in shares)		137
Issuance of common stock	1,372		1,372			1,372
Repurchase of Common Stock During Period, (in shares)	(262)	(262)
Repurchase of common stock	(4,360)		(1,890)	(2,470)		(4,360)
Shares Paid for Tax Withholding for Share Based Compensation ( in shares)	(12)	(12)
Payments Related to Tax Withholding for Share-based Compensation	(200)		(200)			(200)
Cash dividends declared per common share	(1,501)			(1,501)		(1,501)
Tax effects from employee stock incentive plans	(66)		(66)			(66)
Share-based compensation expense	1,401		1,401			1,401
Purchase acquisitions	6		6			6
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 28, 2012	15
Ending Balance at Jul. 28, 2012	51,301		39,271	11,354	661	51,286	15
Stockholders' Equity Attributable to Parent at Jul. 28, 2012	51,286
Ending Balance (in shares) at Jul. 28, 2012		5,298
Net income	9,983			9,983		9,983
Other comprehensive (loss) income	(60)				(53)	(53)	(7)
Issuance of common stock (in shares)		235
Issuance of common stock	3,338		3,338			3,338
Repurchase of Common Stock During Period, (in shares)	(128)	(128)
Repurchase of common stock	(2,773)		(961)	(1,812)		(2,773)
Shares Paid for Tax Withholding for Share Based Compensation ( in shares)	(16)	(16)
Payments Related to Tax Withholding for Share-based Compensation	(330)		(330)			(330)
Cash dividends declared per common share	(3,310)			(3,310)		(3,310)
Tax effects from employee stock incentive plans	(204)		(204)			(204)
Share-based compensation expense	1,120		1,120			1,120
Purchase acquisitions	63		63			63
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 27, 2013	8
Ending Balance at Jul. 27, 2013	59,128		42,297	16,215	608	59,120	8
Stockholders' Equity Attributable to Parent at Jul. 27, 2013	$ 59,120
Ending Balance (in shares) at Jul. 27, 2013		5,389