Goodwill And Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			3 Months Ended		0 Months Ended
	Oct. 27, 2013	Oct. 28, 2012	Jul. 28, 2013	Oct. 27, 2013 Minimum [Member]	Oct. 27, 2013 Maximum [Member]	Aug. 08, 2013 Kelsen [Member]
Finite-Lived Intangible Assets [Line Items]
Payments to Acquire Businesses, Gross						$ 331
Goodwill	2,461		2,297			136
Amortization of Intangible Assets	4	3
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	17
Finite-Lived Intangible Assets, Amortization Expense, Year Two	17
Finite Lived Intangible Assets, Amortization Expense, Year Three	17
Finite Lived Intangible Assets, Amortization Expense, Year Four	17
Finite Lived Intangible Assets, Amortization Expense, Year Five	$ 13
Asset useful lives minimum range, years				5 years	20 years