Share Repurchases (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended					25 Months Ended	12 Months Ended
	Jul. 28, 2013	Jul. 29, 2012	Jul. 31, 2011	Jul. 29, 2012 June 2011 Program [Member]	Jul. 31, 2011 June 2011 Program [Member]	Jul. 28, 2013 June 2011 Program [Member]	Jul. 28, 2013 Treasury Stock [Member]	Jul. 29, 2012 Treasury Stock [Member]	Jul. 31, 2011 Treasury Stock [Member]
Statement [Line Items]
Capital Stock, Shares Authorized	560	560
Common Stock, Par or Stated Value Per Share	$ 0.0375	$ 0.0375
Preferred Stock, Shares Authorized	40	40
Treasury stock retired, shares	219						219
Authorized amount for shares repurchase						$ 1,000
Shares repurchased, shares							4	13	21
Shares repurchased, value	153	412	728	250	550		153	412	728
Stock Repurchase Program, Remaining Authorized Repurchase Amount						$ 750