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Borrowings (Schedule Of Short-Term Debt) (Details) - USD ($)
$ in Millions
Jan. 23, 2016
Jul. 25, 2015
Short-term Debt [Line Items]    
Amount $ 3,008 $ 3,897
Current portion of long-term debt    
Short-term Debt [Line Items]    
Amount $ 3,006 $ 3,894
Effective Rate 3.12% 2.48%
Other short-term debt    
Short-term Debt [Line Items]    
Amount $ 2 $ 3
Effective Rate 2.08% 2.44%