Goodwill And Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Nov. 02, 2014	Oct. 27, 2013	Aug. 03, 2014
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 2,379		$ 2,433
Amortization of Intangible Assets	4	4
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	13
Finite Lived Intangible Assets, Amortization Expense, Year Five	$ 13
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years