Borrowings (Schedule Of Short-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	Oct. 25, 2014	Jul. 26, 2014
Short-term Debt [Line Items]
Amount	$ 1,357	$ 508
Current portion of long-term debt
Short-term Debt [Line Items]
Amount	1,350	500
Effective Rate	1.38%	3.11%
Other short-term debt
Short-term Debt [Line Items]
Amount	$ 7	$ 8
Effective Rate	2.76%	2.67%