Goodwill And Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended			6 Months Ended		0 Months Ended
	Jan. 26, 2014	Jan. 27, 2013	Jul. 28, 2013	Jan. 26, 2014 Minimum [Member]	Jan. 26, 2014 Maximum [Member]	Aug. 08, 2013 Kelsen [Member]
Finite-Lived Intangible Assets [Line Items]
Payments to Acquire Businesses, Gross						$ 331
Goodwill	2,381		2,297			136
Amortization of Intangible Assets	9	7
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	18
Finite-Lived Intangible Assets, Amortization Expense, Year Two	18
Finite Lived Intangible Assets, Amortization Expense, Year Three	18
Finite Lived Intangible Assets, Amortization Expense, Year Four	18
Finite Lived Intangible Assets, Amortization Expense, Year Five	$ 14
Finite-Lived Intangible Asset, Useful Life				5 years	20 years