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Goodwill And Intangible Assets (Intangible Assets) (Details) (USD $)
In Millions, unless otherwise specified
May 03, 2015
Aug. 03, 2014
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 249us-gaap_FiniteLivedIntangibleAssetsGross $ 253us-gaap_FiniteLivedIntangibleAssetsGross
Finite-Lived Intangible Assets, Accumulated Amortization (48)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (35)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Finite-Lived Intangible Assets, Net 201us-gaap_FiniteLivedIntangibleAssetsNet 218us-gaap_FiniteLivedIntangibleAssetsNet
Indefinite-Lived Intangible Assets (Excluding Goodwill) 932us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill 957us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Total net intangible assets 1,133us-gaap_IntangibleAssetsNetExcludingGoodwill 1,175us-gaap_IntangibleAssetsNetExcludingGoodwill
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 174us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
178us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Developed Technology Rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 40us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
40us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Other Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 35us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
$ 35us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember