Consolidated Statements Of Equity Consolidated Statements of Equity (Parenthetical) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	6 Months Ended
	Jan. 26, 2013	Jan. 28, 2012
Aggregate Authorized Common Stock Repurchase	$ 82,000,000,000
Common Stock, Dividends, Per Share, Declared	$ 0.28	$ 0.12
Cumulative stock repurchased and retired shares	3,780
Cumulative Stock Repurchased And Retired Value	76,886,000,000
Parent [Member]
Cumulative Stock Repurchased And Retired Value	76,886,000,000
Retained Earnings [Member]
Cumulative Stock Repurchased And Retired Value	59,547,000,000
Common Stock Including Additional Paid in Capital [Member]
Cumulative Stock Repurchased And Retired Value	$ 17,339,000,000
Common Stock [Member]
Cumulative stock repurchased and retired shares	3,780