Borrowings (Schedule Of Short-Term Debt) (Details) - USD ($) $ in Millions	Oct. 28, 2017	Jul. 29, 2017
Short-term Debt [Line Items]
Amount	$ 10,239	$ 7,992
Current portion of long-term debt
Short-term Debt [Line Items]
Amount	$ 4,748	$ 4,747
Effective Rate	1.70%	1.66%
Commercial paper
Short-term Debt [Line Items]
Amount	$ 5,491	$ 3,245
Effective Rate	1.25%	1.16%