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Goodwill And Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 01, 2021
Aug. 02, 2020
Jul. 28, 2019
Finite-Lived Intangible Assets [Line Items]      
Amortization of Intangible Assets $ 42 $ 43 $ 48
Finite-Lived Intangible Asset, Expected Amortization, Year One 41    
Finite-Lived Intangible Asset, Expected Amortization, Year Two 41    
Finite-Lived Intangible Asset, Expected Amortization, Year Three 41    
Finite-Lived Intangible Asset, Expected Amortization, Year Four 41    
Finite-Lived Intangible Asset, Expected Amortization, Year Five $ 41    
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortization of Intangible Assets     $ 9
Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 17 years