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Goodwill And Intangible Assets (Intangible Assets) (Details) - USD ($)
$ in Millions
9 Months Ended
Apr. 28, 2019
Jul. 29, 2018
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 907 $ 953
Finite-Lived Intangible Assets, Accumulated Amortization (81) (40)
Finite-Lived Intangible Assets, Net 826 913
Indefinite-lived Intangible Assets (Excluding Goodwill) 2,761 2,902
Total net intangible assets 3,587 3,815
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 890 936
Finite-Lived Intangible Assets, Accumulated Amortization (67) (34)
Finite-Lived Intangible Assets, Net 823 902
Other Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 17 17
Finite-Lived Intangible Assets, Accumulated Amortization (14) (6)
Finite-Lived Intangible Assets, Net $ 3 $ 11
Minimum [Member] | Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 10 years  
Minimum [Member] | Other Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 1 year 6 months  
Maximum [Member] | Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 22 years  
Maximum [Member] | Other Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 20 years