Borrowings (Schedule Of Short-Term Debt) (Details) - USD ($) $ in Millions	Apr. 30, 2016	Jul. 25, 2015
Short-term Debt [Line Items]
Amount	$ 4,164	$ 3,897
Current portion of long-term debt
Short-term Debt [Line Items]
Amount	$ 4,163	$ 3,894
Effective Rate	0.94%	2.48%
Other short-term debt
Short-term Debt [Line Items]
Amount	$ 1	$ 3
Effective Rate	2.08%	2.44%