Employee Stock Benefit Plans - Additional Information (Detail) (USD $)	12 Months Ended				12 Months Ended		12 Months Ended										12 Months Ended
	Jul. 27, 2013 stock_incentive_plan	Jul. 28, 2012	Jul. 30, 2011	Jul. 26, 2013	Jul. 27, 2013 2005 Plan	Nov. 12, 2009 2005 Plan	Jul. 27, 2013 2005 Plan Stock awards prior to November 12, 2009 [Member]	Jul. 27, 2013 2005 Plan Stock awards subsequent to November 12, 2009 [Member]	Jul. 27, 2013 2005 Plan Employee Stock Option Minimum	Jul. 27, 2013 2005 Plan Employee Stock Option Maximum	Jul. 27, 2013 2005 Plan Restricted Stock Units (RSUs) [Member] Minimum	Jul. 27, 2013 2005 Plan Restricted Stock Units (RSUs) [Member] Maximum	Jul. 27, 2013 2005 Plan Performance Based Restricted Stock Units	Jul. 27, 2013 2005 Plan Performance Based Restricted Stock Units Minimum	Jul. 27, 2013 2005 Plan Performance Based Restricted Stock Units Maximum	Jul. 27, 2013 Supplemental Plan	Jul. 27, 2013 1996 Plan M	Jul. 27, 2013 Employee Stock [Member]	Jul. 28, 2012 Employee Stock [Member]	Jul. 30, 2011 Employee Stock [Member]	Jul. 27, 2013 Defined Contribution Pension	Jul. 28, 2012 Defined Contribution Pension	Jul. 30, 2011 Defined Contribution Pension	Jul. 27, 2013 Defined Contribution Pension Minimum	Jul. 27, 2013 Defined Contribution Pension Catch Up Contribution [Member]	Jul. 27, 2013 Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]	Jul. 28, 2012 Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock incentive plans	5
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized					559,000,000											9,000,000	2,500,000,000	471,400,000
Reduction in number of shares available for issuance after amendment						1.5
Stock options and stock appreciation rights exercise price percentage of the fair market value of the underlying stock on the grant date					100.00%												100.00%
Prior to 11/12/09, expiration date for stock options and stock appreciation rights, max time from grant date prior to date, in years							9 years	10 years									9 years
Performance restricted stock units, based on operating performance goals	50.00%
Performance restricted stock units, based on TSR	50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage									20.00%	25.00%	20.00%	25.00%		0.00%	150.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period									0 years 36 months	0 years 48 months			3 years
Percentage in which stock options and RSUs become exercisable for within one year from date of grant, minimum																	20.00%
Percentage in which stock options and RSUs become exercisable for within one year from date of grant, maximum																	25.00%
Number of months in which stock options ratably exercise, maximum																	48
Number of months in which stock options ratably exercise, minimum																	36
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights																	Certain other grants utilized a 60-month ratable vesting schedule. In addition, the Board of Directors, or other committees administering the 1996 Plan, had the discretion to use a different vesting schedule and did so from time to time.
ESPP-Offering Period Plan Description																		24-month offering period, which consists of four consecutive 6-month purchase periods
ESPP-Termination of Purchase Plan																		Jan. 03, 2020
ESPP-Discount rate																		15.00%
Shares issued under employee purchase plan, shares																		36,000,000	35,000,000	34,000,000
ESPP-shares available for issuance, shares																		51,000,000
Total compensation cost related to unvested share-based awards	$ 2,300,000,000
Expected period of recognition of compensation cost, years	2 years 6 months
Total pretax intrinsic value	661,000,000	333,000,000	312,000,000
Closing stock price				$ 25.50
In-the-money exercisable stock option shares	155,000,000
Number Exercisable, shares	271,000,000	512,000,000
Stock Options Exercisable, Weighted-Average Exercise Price per Share, dollars per share	$ 24.84	$ 22.65
Employee contribution minimum rate																					75.00%			1.00%	75.00%
Company maximum match rate																					100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match																					4.50%					4.50%
Defined Contribution Plan Maximum Matching Contribution By Company																					11,475
Salaries, Wages and Officers' Compensation																					255,000					1,500,000
Company's matching contributions																					234,000,000	231,000,000	239,000,000
Deferred compensation liability																										$ 441,000,000	$ 355,000,000