Borrowings (Schedule Of Short-Term Debt) (Detail) (USD $) In Millions, unless otherwise specified	Jul. 27, 2013	Jul. 28, 2012
Short-term Debt [Line Items]
Debt, Current	$ 3,283	$ 31
Current portion of long-term debt
Short-term Debt [Line Items]
Debt, Current	3,273	0
Short-term debt, Weighted-Average Interest Rate	0.63%	0.00%
Other notes and borrowings
Short-term Debt [Line Items]
Debt, Current	$ 10	$ 31
Short-term debt, Weighted-Average Interest Rate	2.52%	6.72%