Consolidated Statements Of Equity Consolidated Statements of Equity (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Oct. 27, 2012	Oct. 29, 2011
Common Stock, Dividends, Per Share, Declared	$ 0.14	$ 0.06
Cumulative stock repurchased and retired shares	3,755
Cumulative Stock Repurchased And Retired Value	$ 76,386
Parent [Member]
Cumulative Stock Repurchased And Retired Value	76,386
Retained Earnings [Member]
Cumulative Stock Repurchased And Retired Value	59,231
Common Stock Including Additional Paid in Capital [Member]
Cumulative Stock Repurchased And Retired Value	$ 17,155
Common Stock [Member]
Cumulative stock repurchased and retired shares	3,755